Fixed workflow (again #3)

Author: EchterAlsFake

.github/workflows/python-app.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Install system dependencies
       run: |
         sudo apt-get update
-        sudo apt-get install -y libegl1-mesa xvfb libxcb-cursor0
+        sudo apt-get install -y libegl1-mesa xvfb libxcb-cursor0 qt5-default qttools5-dev-tools
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip