Update app.py

app.py

@@ -120,7 +120,9 @@ def set_speed(choice):
 
 def start_game_server():
     global GAME_INSTANCE, BRAIN_WEIGHTS_JSON
-    
+
+    import os
+    os.environ["SDL_VIDEODRIVER"] = "dummy"
     pygame.init()
     brain = load_brain()
     if not brain: return False