Install dev dependencies in CI

Author: JelteF

.github/workflows/ci.yaml

@@ -63,7 +63,7 @@ jobs:
         run: cp pgcommitfest/local_settings_example.py pgcommitfest/local_settings.py
 
       - name: Install dependencies
-        run: uv sync
+        run: uv sync --extra dev
 
       - name: Run tests
         run: uv run pytest --create-db