fix: ensure main branch checkout before git-auto-commit in container

- Add explicit git safe.directory configuration for container environment
- Ensure main branch is checked out before git-auto-commit-action runs
- Addresses detached HEAD warning when running in Docker containers

Author: coenttb

.github/workflows/swift-format.yml

@@ -41,6 +41,11 @@ jobs:
       - name: Format
         run: swift-format format --ignore-unparsable-files --recursive --in-place Sources Tests
 
+      - name: Configure git for container
+        run: |
+          git config --global --add safe.directory $GITHUB_WORKSPACE
+          git checkout main
+
       - uses: stefanzweifel/git-auto-commit-action@v7
         with:
           commit_message: Run swift-format