fix(pytest): Add more Xvfb tricks to try and fix tkinter integration tests in uv

Author: amilcarlucas

.github/workflows/pytest.yml

@@ -52,14 +52,25 @@ jobs:
         run: |
           uv pip install --editable .[dev]
 
+      - name: Setup virtual display
+        run: |
+          export DISPLAY=:99.0
+          Xvfb :99 -screen 0 1024x768x24 -ac +extension GLX +render -noreset &
+          sleep 3  # Give Xvfb time to start
+
       - name: Test with pytest
         id: pytest
         continue-on-error: false
+        env:
+          # Ensure proper X11 and GUI environment
+          LIBGL_ALWAYS_SOFTWARE: 1
+          DISPLAY: ":99.0"
+          QT_QPA_PLATFORM: "offscreen"
+          MPLBACKEND: "Agg"
+          PYTHONPATH: ${{ github.workspace }}
+          CI: "true"  # Mark as CI environment
         run: |
-          export LIBGL_ALWAYS_SOFTWARE=1
-          export DISPLAY=:99
-          Xvfb :99 -screen 0 1024x768x16 &
-          uv run pytest --cov=ardupilot_methodic_configurator --cov-report=xml:tests/coverage.xml --md=tests/results-${{ matrix.python-version }}.md --junit-xml=tests/results-junit.xml
+          uv run --python=${{ matrix.python-version }} pytest --cov=ardupilot_methodic_configurator --cov-report=xml:tests/coverage.xml --md=tests/results-${{ matrix.python-version }}.md --junit-xml=tests/results-junit.xml
 
       - name: Fix coverage paths
         run: |