Switch Quay to using an in-container memcached for data model caching

app.py

@@ -22,7 +22,7 @@ from data import model
 from data.archivedlogs import LogArchive
 from data.billing import Billing
 from data.buildlogs import BuildLogs
-from data.cache import InMemoryDataModelCache
+from data.cache import get_model_cache
 from data.model.user import LoginWrappedDBUser
 from data.queue import WorkQueue, BuildMetricQueueReporter
 from data.userevent import UserEventsBuilderModule
@@ -178,9 +178,7 @@ Principal(app, use_sessions=False)
 
 tf = app.config['DB_TRANSACTION_FACTORY']
 
-# TODO(jschorr): make this configurable
-model_cache = InMemoryDataModelCache()
-
+model_cache = get_model_cache(app.config)
 avatar = Avatar(app)
 login_manager = LoginManager(app)
 mail = Mail(app)