add patchesstrategicmerge for prod

kustomize-guestbook/overlays/prod/ingress.yaml

@@ -0,0 +1,14 @@
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: kustomize-guestbook-ingress
+  namespace:
+spec:
+  rules:
+  - host: kustomize-guestbook-argocd.natwest-labs.com
+    http:
+      paths:
+      - backend:
+          serviceName: guestbook-ui
+          servicePort: 80
+        path: /

kustomize-guestbook/overlays/prod/kustomization.yaml

@@ -1,3 +1,5 @@
 bases:
 - ../../base
 namePrefix: prod-
+patchesStrategicMerge:
+- ingress.yaml