fix: use pipx and virtual environments for CI actions

.github/workflows/ci.yaml

@@ -23,7 +23,7 @@ on:
 jobs:
   inclusive-naming-check:
     name: Inclusive naming check
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -34,34 +34,34 @@ jobs:
 
   lint:
     name: Lint
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Install dependencies
-        run: python3 -m pip install tox
+        run: pipx install tox
       - name: Run linters
         run: tox run -e lint
 
   unit-test:
     name: Unit tests
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Install dependencies
-        run: python3 -m pip install tox
+        run: pipx install tox
       - name: Run tests
         run: tox run -e unit
 
   type-check:
     name: Static type checking
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Install dependencies
-        run: python3 -m pip install tox
+        run: pipx install tox
       - name: Run tests
         run: tox run -e type
 
@@ -72,7 +72,7 @@ jobs:
         bases:
           - [email protected]
     name: Integration tests (LXD) | ${{ matrix.bases }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs:
       - inclusive-naming-check
       - lint
@@ -81,6 +81,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+      - name: Install dependencies
+        run: pipx install tox
       - name: Setup operator environment
         uses: charmed-kubernetes/actions-operator@main
         with:

.github/workflows/nightly-TICS.yaml

@@ -10,15 +10,23 @@ permissions:
 
 jobs:
   TICS:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Install dependencies
+      - name: Install requirements
         run: |
-          python3 -m pip install tox pylint flake8
-          python3 -m pip install --requirement test-requirements.txt
+          sudo apt update -y
+          sudo apt install python3-venv -y
+
+      - name: Create and activate virtual environment
+        run: |
+          python3 -m venv .venv
+          . .venv/bin/activate
+          pip install tox pylint flake8 pytest pyyaml
+          pip install --requirement test-requirements.txt
+          echo PATH=$PATH >> $GITHUB_ENV
 
       - name: Run coverage tests
         run: |

.github/workflows/release.yaml

@@ -27,7 +27,7 @@ jobs:
     name: Release to CharmHub
     needs:
       - ci-tests
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: true
       matrix:
@@ -38,8 +38,8 @@ jobs:
       - name: Select charmhub channel
         uses: canonical/charming-actions/[email protected]
         id: channel
-      - name: Install dependencies
-        run: python3 -m pip install tox
+      - name: Install tox
+        run: pipx install tox
       - name: Stage charm
         run: tox run -e stage -- ${{ matrix.charm }} --clean
       - name: Upload charm to charmhub