GHA: test app launch

The minimum testing we can do is checking that the GUI can be launched.

Author: dweindl

.github/workflows/ci.yml

@@ -22,3 +22,46 @@ jobs:
 
     - name: Run pre-commit hooks
       run: pre-commit run --all-files
+
+  launch:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.11', '3.13']
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v5
+
+    - name: Prepare Python
+      uses: actions/setup-python@v6
+      with:
+          python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y xvfb libegl1 libqt6gui6 libxcb-cursor0
+
+    - name: Install PEtabGUI
+      run: |
+        python -m pip install --upgrade pip
+        pip install .
+
+    - name: Launch GUI
+      # Ensure that we can launch the GUI
+      run: |
+        echo "Launching Xvfb"
+        Xvfb :99 -screen 0 1920x1200x24 &
+        export DISPLAY=:99
+        echo "Running petab_gui --version"
+        petab_gui --version
+        echo "Running petab_gui without arguments"
+        petab_gui &
+        echo $! > petabgui_pid.txt
+        sleep 10
+        kill $(cat petabgui_pid.txt)
+        echo "Running petab_gui with example problem"
+        petab_gui example/problem.yaml &
+        echo $! > petabgui_pid.txt
+        sleep 10
+        kill $(cat petabgui_pid.txt)