feat: Add support for loadBalancerIP in service configuration (#198

* feat: Add support for loadBalancerIP in service configuration

* refactor: use an array in service.loadBalancer values

helm-charts/azure-api-management-gateway/README.md

@@ -110,6 +110,7 @@ their default values.
 | `observability.statsD.tagFormat` | Defines the [tagging format](https://github.com/prometheus/statsd_exporter#tagging-extensions) in StatsD metrics as per the official docs. Value can be `none`, `librato`, `dogStatsD`, `influxDB`. Learn more in [our documentation](https://docs.microsoft.com/azure/api-management/how-to-configure-local-metrics-logs#configure-the-self-hosted-gateway-to-emit-metrics). | N/A |
 | `service.type` | Type of Kubernetes service to use to expose to serve traffic | `ClusterIP` |
 | `service.annotations` | Annotations to add to the Kubernetes service | `{}` |
+| `service.loadBalancer.ip` | Attach a pre-existing static IP to a `LoadBalancer` type service. Learn more in the [Kubernetes docs](https://kubernetes.io/docs/concepts/services-networking/service/#loadbalancer). | |
 | `service.ports.http` | Port for HTTP traffic on service for other pods to talk to | `8080` |
 | `service.ports.https` | Port for HTTPs traffic on service for other pods to talk to | `8081` |
 | `service.ports.instance.synchronization` | Port used for internal discovery of gateway instances to synchronize across all of them, ie for rate limiting. | `4290` |

helm-charts/azure-api-management-gateway/templates/service.yaml

@@ -10,6 +10,9 @@ metadata:
   {{- end }}
 spec:
   type: {{ .Values.service.type }}
+{{- if (.Values.service.loadBalancer).ip }}
+  loadBalancerIP: {{ .Values.service.loadBalancer.ip }}
+{{- end }}
   ports:
     - port: {{ .Values.service.ports.http }}
       targetPort: http