Set environment variables for Kivy to prevent graphics initialization during build

Author: alevilar

.github/workflows/android.build.yml

@@ -27,7 +27,7 @@ jobs:
         with:
           python-version: '3.11'
 
-      - name: Get pip cache dir
+      - name: Get pip cache dir 
         id: pip-cache
         run: |
           echo "dir=$(pip cache dir)" >> $GITHUB_OUTPUT

.github/workflows/desktop.build.yml

@@ -72,7 +72,11 @@ jobs:
             xvfb-run --auto-servernum pyinstaller fiscalberry-gui.spec
           else
             echo "Running PyInstaller directly on $RUNNER_OS..."
-            KIVY_NO_WINDOW=1 pyinstaller fiscalberry-gui.spec
+            # Set environment variables to prevent Kivy from trying to initialize graphics
+            export KIVY_NO_WINDOW=1
+            export KIVY_GL_BACKEND=mock
+            export KIVY_GRAPHICS=mock
+            pyinstaller fiscalberry-gui.spec
           fi
 
       - name: List dist directory contents (after build) # Keep this for debugging if needed