to override the previous defaultBackend (frontend-nodeport) we need to explicitly set it (GoogleCloudPlatform#698)

Author: mathieu-benoit

.github/release-cluster/frontend-ingress.yaml

@@ -7,6 +7,11 @@ metadata:
     networking.gke.io/managed-certificates: online-boutique-certificate
     networking.gke.io/v1beta1.FrontendConfig: frontend-frontend-config
 spec:
+  defaultBackend:
+    service:
+      name: frontend
+      port:
+        number: 80
   rules:
   - http:
       paths:
@@ -16,4 +21,4 @@ spec:
           service:
             name: frontend
             port:
-              number: 80
+              number: 80