- Add web hook queue code back in. We'll remove it and turn it off after this CL goes to prod

- Make notification lookup always be by repo and its UUID, rather than the internal DB ID
- Add the init script for the notification worker

app.py

@@ -80,6 +80,9 @@ dockerfile_build_queue = WorkQueue(app.config['DOCKERFILE_BUILD_QUEUE_NAME'], tf
                                    reporter=queue_metrics.report)
 notification_queue = WorkQueue(app.config['NOTIFICATION_QUEUE_NAME'], tf)
 
+# TODO: Remove this in the prod push following the notifications change.
+webhook_queue = WorkQueue(app.config['WEBHOOK_QUEUE_NAME'], tf)
+
 database.configure(app.config)
 model.config.app_config = app.config
 model.config.store = storage