Add coverage target to weekly GitHub workflow

Signed-off-by: mulhern <[email protected]>

.github/workflows/weekly.yml

@@ -27,3 +27,27 @@ jobs:
           ${{ matrix.dependencies }}
       - name: ${{ matrix.task }}
         run: ${{ matrix.task }}
+
+  coverage:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          components: cargo
+          toolchain: nightly
+      - name: Install dependencies
+        run: |
+          sudo apt-get -q update
+          sudo apt-get -y install libdevmapper-dev
+          sudo apt-get -y install llvm
+      - name: Set toolchain override with sudo
+        run: sudo /home/runner/.cargo/bin/rustup override set nightly
+      - name: Run all tests on nightly toolchain with profiling
+        run: sudo PATH=$GITHUB_WORKSPACE/.cargo/bin:$PATH PROFILE=1 make -f Makefile sudo_test  # yamllint disable rule:line-length
+      - name: Merge raw coverage files
+        run: |
+          llvm-profdata merge --sparse *.profraw -o result.profdata
+          rm *.profraw
+      - name: Generate coverage report
+        run: llvm-cov report -object $(find target/debug/deps/ -regex ".*devicemapper-[0-9a-f]*") -instr-profile=result.profdata --summary-only