Add option to conditionally create Service resource

- Add new parameter `service.create` (default: false) to control Service creation
- Wrap Service template in conditional to respect the new parameter
- Update documentation and default values to reflect this change

This allows users who don't need the Service resource (e.g., when using
Ingress directly or external service management) to skip its creation.

Author: bwdmr

README.md

@@ -47,6 +47,7 @@ their default values.
 | `serviceAccount.name`       | ServiceAccount name                                                                        | `nil`           |
 | `serviceAccount.annotations` | Annotations to add to the ServiceAccount                                                  | `{}`            |
 | `deployment.annotations`    | Annotations to add to the Deployment                                                       | `{}`            |
+| `service.create`     | Create Service                                                                                    | `false`         |
 | `service.port`              | TCP port on which the service is exposed                                                   | `5000`          |
 | `service.type`              | service type                                                                               | `ClusterIP`     |
 | `service.clusterIP`         | if `service.type` is `ClusterIP` and this is non-empty, sets the cluster IP of the service | `nil`           |

templates/service.yaml

@@ -1,3 +1,4 @@
+{{- if .Values.service.create -}}
 apiVersion: v1
 kind: Service
 metadata:
@@ -50,3 +51,4 @@ spec:
   selector:
     app: {{ template "docker-registry.name" . }}
     release: {{ .Release.Name }}
+{{- end -}}

values.yaml

@@ -26,6 +26,7 @@ image:
 deployment: {}
   # annotations:
 service:
+  create: false
   name: registry
   type: ClusterIP
   # sessionAffinity: None