CI: explicity execute pre-commit in CI on PRs

.github/workflows/pre-commit.yml

@@ -0,0 +1,25 @@
+name: pre-commit
+
+on:
+  pull_request:
+    branches:
+      - '**'
+
+jobs:
+  run-pre-commit:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+      with:
+        python-version: '3.12'
+
+    - name: Install pre-commit
+      run: pip install pre-commit
+
+    - name: Run pre-commit
+      run: pre-commit run --all-files
+
+    - name: Fail on diff after pre-commit is run
+      run: git diff --exit-code