Fix: Add server object

fast_dash_app.py

@@ -20,6 +20,7 @@ def generate_image(input_tiff_image: Upload) -> (Image, Image):
     return input_image, output_image
 
 app = FastDash(generate_image, port=8000)
+server = app.server
 
 if __name__ == "__main__":
     app.run()