add nginx specific address pool

ingress-nginx-values.yaml

@@ -1,6 +1,9 @@
 controller:
-  # service:
-  #   externalTrafficPolicy: Local
+  service:
+    externalTrafficPolicy: Local
+    annotations:
+      metallb.universe.tf/address-pool: "nginx"
+      metallb.universe.tf/allow-shared-ip: "nginx"
   config:
     enable-real-ip: "true"
     use-forwarded-headers: "true"