Add caching for pre-commit on CI

.github/actions/pre-commit/action.yml

@@ -0,0 +1,18 @@
+name: run pre-commit checks
+description: run all pre-commit managed checks
+inputs:
+  pre-commit-home:
+    description: cache dir to use
+    required: true
+    default: ${{ github.workspace }}/.pre-commit-cache
+runs:
+  using: "composite"
+  steps:
+    - id: python-interpreter-hash
+      run: echo "HASH=$(python -VV | sha256sum | cut -d' ' -f1)" >> $$GITHUB_OUTPUTS
+    - uses: actions/cache@v4
+      with:
+        path: ${{ env.PRE_COMMIT_HOME }}
+        key: pre-commit|${{ env.PYTHON_INTERPRETER_HASH }}|${{ hashFiles('.pre-commit-config.yaml') }}
+    - name: Run commit checks
+      run: poetry run pre-commit run -a

.github/workflows/pr.yml

@@ -7,6 +7,8 @@ on:
 jobs:
   check:
     runs-on: ubuntu-latest
+    env:
+      PRE_COMMIT_HOME: $CI_PROJECT_DIR/.pre-commit-cache
     steps:
       - uses: actions/checkout@v4
       - run: pipx install poetry==1.7.1
@@ -16,6 +18,7 @@ jobs:
           cache: poetry
       - name: Install dependencies
         run: poetry install --with=dev
+      - uses: ./.github/actions/pre-commit
       - name: Run commit checks
         run: poetry run pre-commit run -a
       - name: Run tests