Add caching for pre-commit on CI

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

@@ -0,0 +1,22 @@
+name: run pre-commit checks
+description: run all pre-commit managed checks
+inputs:
+  pre-commit-home:
+    description: cache dir to use
+    required: true
+    default: ${{ github.workspace }}/.pre-commit-cache
+runs:
+  using: "composite"
+  steps:
+    - id: python-interpreter-hash
+      shell: bash
+      run: echo "HASH=$(python -VV | sha256sum | cut -d' ' -f1)" >> $GITHUB_OUTPUTS
+    - uses: actions/cache@v4
+      with:
+        path: ${{ inputs.pre-commit-home }}
+        key: pre-commit|${{ steps.python-interpreter-hash.outputs.HASH }}|${{ hashFiles('.pre-commit-config.yaml') }}
+    - name: Run commit checks
+      shell: bash
+      env:
+        PRE_COMMIT_HOME: ${{ inputs.pre-commit-home }}
+      run: poetry run pre-commit run -a

.github/workflows/pr.yml

@@ -17,6 +17,6 @@ jobs:
       - name: Install dependencies
         run: poetry install --with=dev
       - name: Run commit checks
-        run: poetry run pre-commit run -a
+        uses: ./.github/actions/pre-commit
       - name: Run tests
         run: ./scripts/test