ci: add PyQt6 checker workflow job

Author: gounux

.github/workflows/continuous_integration.yml

@@ -18,6 +18,33 @@ jobs:
         run: |
           pipenv install pre_commit
           pipenv run python -m pre_commit run --all-files
+
+  pyqt6-check:
+    name: PyQt6 compatibility check
+    runs-on: ubuntu-latest
+    container:
+      image: registry.gitlab.com/oslandia/qgis/pyqgis-4-checker/pyqgis-qt-checker:latest
+      volumes:
+        - /tmp/.X11-unix:/tmp/.X11-unix
+        - ${{ github.workspace }}:/home/pyqgisdev/
+      options: --user root
+    steps:
+      - name: Get source code
+        uses: actions/checkout@v6
+
+      - name: Check PyQt5 to PyQt6 compatibility
+        run: |
+          pyqt5_to_pyqt6.py --dry_run libqfieldsync/
+          pyqt5_to_pyqt6.py --logfile pyqt6_checker.log libqfieldsync/
+
+      - name: Upload script report if script fails
+        uses: actions/upload-artifact@v6
+        if: ${{ failure() }}
+        with:
+          name: pyqt6-checker-error-report
+          path: pyqt6_checker.log
+          retention-days: 7
+
   test:
     runs-on: ubuntu-22.04
     strategy: