Add loadbalancerIP as a helm parameter (#2766)

Add loadbalancerIP as helm parameter

Problem: Users want to specify load balancer IP when doing a helm install or upgrade.

Solution: Add a parameter loadBalancerIP under service in values.yaml.

charts/nginx-gateway-fabric/README.md

@@ -299,6 +299,7 @@ The following table lists the configurable parameters of the NGINX Gateway Fabri
 | `service.annotations` | The annotations of the NGINX Gateway Fabric service. | object | `{}` |
 | `service.create` | Creates a service to expose the NGINX Gateway Fabric pods. | bool | `true` |
 | `service.externalTrafficPolicy` | The externalTrafficPolicy of the service. The value Local preserves the client source IP. | string | `"Local"` |
+| `service.loadBalancerIP` | The static IP address for the load balancer. Requires service.type set to LoadBalancer. | string | `""` |
 | `service.ports` | A list of ports to expose through the NGINX Gateway Fabric service. Update it to match the listener ports from your Gateway resource. Follows the conventional Kubernetes yaml syntax for service ports. | list | `[{"name":"http","port":80,"protocol":"TCP","targetPort":80},{"name":"https","port":443,"protocol":"TCP","targetPort":443}]` |
 | `service.type` | The type of service to create for the NGINX Gateway Fabric. | string | `"LoadBalancer"` |
 | `serviceAccount.annotations` | Set of custom annotations for the NGINX Gateway Fabric service account. | object | `{}` |

charts/nginx-gateway-fabric/templates/service.yaml

@@ -17,6 +17,9 @@ spec:
   {{- end }}
 {{- end }}
   type: {{ .Values.service.type }}
+{{- if and (eq .Values.service.type "LoadBalancer") .Values.service.loadBalancerIP }}
+  loadBalancerIP: {{ .Values.service.loadBalancerIP }}
+{{- end}}
   selector:
     {{- include "nginx-gateway.selectorLabels" . | nindent 4 }}
   ports: # Update the following ports to match your Gateway Listener ports

charts/nginx-gateway-fabric/values.schema.json

@@ -573,6 +573,13 @@
           "required": [],
           "title": "externalTrafficPolicy"
         },
+        "loadBalancerIP": {
+          "default": "",
+          "description": "The static IP address for the load balancer. Requires service.type set to LoadBalancer.",
+          "required": [],
+          "title": "loadBalancerIP",
+          "type": "string"
+        },
         "ports": {
           "description": "A list of ports to expose through the NGINX Gateway Fabric service. Update it to match the listener ports from\nyour Gateway resource. Follows the conventional Kubernetes yaml syntax for service ports.",
           "items": {

charts/nginx-gateway-fabric/values.yaml

@@ -303,6 +303,9 @@ service:
   # -- The annotations of the NGINX Gateway Fabric service.
   annotations: {}
 
+  # -- The static IP address for the load balancer. Requires service.type set to LoadBalancer.
+  loadBalancerIP: ""
+
   # @schema
   # type: array
   # items: