When speaking to version 0.2-beta of the build worker, properly lookup the cached commands and see if we have a matching image/tag in the repository

buildman/jobutil/workererror.py

@@ -57,6 +57,11 @@ class WorkerError(object):
         'io.quay.builder.missingorinvalidargument': {
             'message': 'Missing required arguments for builder',
             'is_internal': True
+        },
+
+        'io.quay.builder.cachelookupissue': {
+            'message': 'Error checking for a cached tag',
+            'is_internal': True
         }
     }