Remove app from GunicornWorker (#1394)

Quay uses GunicornWorker to run background workers in the development
environment. It is not expected to serve any HTTP server.

workers/chunkcleanupworker.py

@@ -34,7 +34,7 @@ class ChunkCleanupWorker(QueueWorker):
             raise JobException()
 
 
-def create_gunicorn_worker():
+def create_gunicorn_worker() -> GunicornWorker:
     """
     follows the gunicorn application factory pattern, enabling
     a quay worker to run as a gunicorn worker thread.
@@ -49,7 +49,6 @@ def create_gunicorn_worker():
     feature_flag = "SwiftStorage" in engines
     worker = GunicornWorker(
         __name__,
-        app,
         ChunkCleanupWorker(chunk_cleanup_queue, poll_period_seconds=POLL_PERIOD_SECONDS),
         feature_flag,
     )