Add pre-commit hook

.github/workflows/pre-commit.yaml

@@ -0,0 +1,28 @@
+name: Pre-commit
+
+on: pull_request
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        fetch-depth: 2  # fetches all history so pre-commit can run properly
+
+    - name: Set up Python
+      uses: actions/setup-python@v3
+      with:
+        python-version: '3.9'  # Use Python 3.9
+
+    - name: Install pre-commit
+      run: pip install pre-commit
+
+    - name: Run pre-commit
+      run: pre-commit run --all-files --show-diff-on-failure
+
+    - name: Cache the pre-commit environment
+      uses: actions/cache@v3
+      with:
+        path: ~/.cache/pre-commit
+        key: ${{ runner.os }}-pre-commit-${{ hashFiles('.pre-commit-config.yaml') }}