Only run flask if the script is invoked directly.

This allows the IDE to run it as a flask application, rather
than just executing script fully.

main.py

@@ -98,4 +98,5 @@ def handle_docker_registry():
     return "", 204
 
 
-app.run("0.0.0.0")
+if __name__ == "__main__":
+    app.run("0.0.0.0")