diff --git a/.github/workflows/ccache.env b/.github/workflows/ccache.env
new file mode 100644
index 0000000000..2cae97776a
--- /dev/null
+++ b/.github/workflows/ccache.env
@@ -0,0 +1,10 @@
+# common ccache env vars for CI
+export CCACHE_SLOPPINESS=file_stat_matches
+
+mkdir -p ~/.ccache
+echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
+echo "compression = true" >> ~/.ccache/ccache.conf
+echo "compression_level = 6" >> ~/.ccache/ccache.conf
+echo "max_size = 400M" >> ~/.ccache/ccache.conf
+ccache -s
+ccache -z
diff --git a/.github/workflows/macos_build.yml b/.github/workflows/macos_build.yml
index 5c5c891fde..e142a796ac 100644
--- a/.github/workflows/macos_build.yml
+++ b/.github/workflows/macos_build.yml
@@ -42,13 +42,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-${{matrix.config}} # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: test build ${{matrix.config}}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}
diff --git a/.github/workflows/test_chibios.yml b/.github/workflows/test_chibios.yml
index 76db9c91d9..8f2d141781 100644
--- a/.github/workflows/test_chibios.yml
+++ b/.github/workflows/test_chibios.yml
@@ -67,13 +67,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-${{matrix.config}}-${{ matrix.toolchain }}-${{ matrix.gcc }}  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: test ${{matrix.config}} ${{ matrix.toolchain }} gcc-${{matrix.gcc}}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}
diff --git a/.github/workflows/test_coverage.yml b/.github/workflows/test_coverage.yml
index e191f6d67e..45749b21e8 100644
--- a/.github/workflows/test_coverage.yml
+++ b/.github/workflows/test_coverage.yml
@@ -46,13 +46,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: Configure CAN
         if: ${{ matrix.config == 'sitltest-can'}}
         run: |
diff --git a/.github/workflows/test_linux_sbc.yml b/.github/workflows/test_linux_sbc.yml
index 7c1ef11688..e36a28fc3d 100644
--- a/.github/workflows/test_linux_sbc.yml
+++ b/.github/workflows/test_linux_sbc.yml
@@ -60,13 +60,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: test ${{matrix.config}} ${{ matrix.toolchain }}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}
diff --git a/.github/workflows/test_replay.yml b/.github/workflows/test_replay.yml
index 69ca68c587..7ecae879f4 100644
--- a/.github/workflows/test_replay.yml
+++ b/.github/workflows/test_replay.yml
@@ -41,13 +41,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: test ${{matrix.config}} ${{ matrix.toolchain }}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}
diff --git a/.github/workflows/test_sitl_copter.yml b/.github/workflows/test_sitl_copter.yml
index bb99604bba..237af06448 100644
--- a/.github/workflows/test_sitl_copter.yml
+++ b/.github/workflows/test_sitl_copter.yml
@@ -38,13 +38,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: build copter ${{ matrix.toolchain }}
         shell: bash
         run: |
@@ -96,13 +90,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-base-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: test ${{matrix.config}}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}
@@ -157,13 +145,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-base-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: build heli
         shell: bash
         run: |
@@ -203,13 +185,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-base-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: test ${{matrix.config}}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}
diff --git a/.github/workflows/test_sitl_periph.yml b/.github/workflows/test_sitl_periph.yml
index 1a81791b70..8a517adf87 100644
--- a/.github/workflows/test_sitl_periph.yml
+++ b/.github/workflows/test_sitl_periph.yml
@@ -31,13 +31,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: install 32-bit libraries
         run: |
           dpkg --add-architecture i386
@@ -90,13 +84,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: install 32-bit libraries
         run: |
           sudo dpkg --add-architecture i386
diff --git a/.github/workflows/test_sitl_plane.yml b/.github/workflows/test_sitl_plane.yml
index 9d4f7df05f..3640bc4e90 100644
--- a/.github/workflows/test_sitl_plane.yml
+++ b/.github/workflows/test_sitl_plane.yml
@@ -38,13 +38,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: build plane ${{ matrix.toolchain }}
         shell: bash
         run: |
@@ -91,13 +85,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-base-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: test ${{matrix.config}}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}
diff --git a/.github/workflows/test_sitl_rover.yml b/.github/workflows/test_sitl_rover.yml
index 1b0ee63153..b87437a330 100644
--- a/.github/workflows/test_sitl_rover.yml
+++ b/.github/workflows/test_sitl_rover.yml
@@ -38,13 +38,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: build rover ${{ matrix.toolchain }}
         shell: bash
         run: |
@@ -91,13 +85,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-base-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: test ${{matrix.config}}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}
diff --git a/.github/workflows/test_sitl_sub.yml b/.github/workflows/test_sitl_sub.yml
index 8d43b72d18..39c25c28b5 100644
--- a/.github/workflows/test_sitl_sub.yml
+++ b/.github/workflows/test_sitl_sub.yml
@@ -38,13 +38,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: build sub ${{ matrix.toolchain }}
         shell: bash
         run: |
@@ -90,13 +84,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-base-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: test ${{matrix.config}}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}
diff --git a/.github/workflows/test_sitl_tracker.yml b/.github/workflows/test_sitl_tracker.yml
index db9fc0586a..8c6abec961 100644
--- a/.github/workflows/test_sitl_tracker.yml
+++ b/.github/workflows/test_sitl_tracker.yml
@@ -38,13 +38,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: build tracker ${{ matrix.toolchain }}
         shell: bash
         run: |
@@ -90,13 +84,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-base-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: test ${{matrix.config}}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}
diff --git a/.github/workflows/test_size.yml b/.github/workflows/test_size.yml
index 09db01cfd1..a1ed220ddb 100644
--- a/.github/workflows/test_size.yml
+++ b/.github/workflows/test_size.yml
@@ -43,16 +43,6 @@ jobs:
           path: ~/.ccache
           key: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-${{steps.ccache_cache_timestamp.outputs.timestamp}}
           restore-keys: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-  # restore ccache from either previous build on this branch or on master
-      - name: setup ccache
-        run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
-
       - name: Build master ${{matrix.config}} ${{ matrix.toolchain }}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}
diff --git a/.github/workflows/test_unit_tests.yml b/.github/workflows/test_unit_tests.yml
index db361317e6..e745cae37b 100644
--- a/.github/workflows/test_unit_tests.yml
+++ b/.github/workflows/test_unit_tests.yml
@@ -46,13 +46,7 @@ jobs:
           restore-keys: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-  # restore ccache from either previous build on this branch or on master
       - name: setup ccache
         run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
+          . .github/workflows/ccache.env
       - name: test ${{matrix.config}} ${{ matrix.toolchain }}
         env:
           CI_BUILD_TARGET: ${{matrix.config}}