Fix workflow race conditions and add conflict handling

- Set max-parallel: 1 to prevent simultaneous pushes
- Add git pull --rebase before push to handle conflicts
- This should resolve the 'cannot lock ref' error

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: smilexth

.github/workflows/mono_repo_publish.yml

@@ -9,6 +9,7 @@ jobs:
     strategy:
       matrix:
         zb: [zb01, zb02, zb03, zb04, zb05, zb06, zb07, zb08, zb09, zb10, zigbee2mqtt-edge, zigbee2mqtt-proxy, common]
+      max-parallel: 1
     steps:
       - name: Checkout source repository
         uses: actions/checkout@v3
@@ -38,6 +39,8 @@ jobs:
               echo "No changes to commit for ${{ matrix.zb }}"
             else
               git commit -m "${{ matrix.zb }} has been updated from legacy codebase"
+              # Pull latest changes before pushing to avoid conflicts
+              git pull origin main --rebase
               git push origin main
               echo "Successfully pushed ${{ matrix.zb }} updates"
             fi