kubernetes: update doc related to registry

- add instructions on how to retain PVC when using helm

kubernetes/README.md

@@ -178,7 +178,8 @@ in desired namespaces by deploying the Certificate resource in the namespace.
 
 # Deploy Private Docker Registry (Deprecated)
 
-The private docker registry is depcrecated in favor of gitea image registry.
+> **Note:** The docker registry helm chart is deprecated in favor of gitea image
+> registry.
 
 Create a new namespace called docker-registry and deploy the private
 docker-registry.
@@ -194,7 +195,12 @@ kubectl create secret generic registry-credentials \
   -n docker-registry
 ```
 
-Next, deploy the docker registry with helm chart:
+Next, deploy the docker registry with helm chart. In the PVC, the following
+annotation is added to ensure that the PVC is not deleted when the helm
+chart is deleted. This is useful to retain the images in the registry even
+after the helm chart is deleted.
+
+`helm.sh/resource-policy: "keep"`
 
 ```bash
 source .env

kubernetes/docker-registry-helm-chart/templates/pvc.yaml

@@ -3,9 +3,11 @@ kind: PersistentVolumeClaim
 metadata:
   name: {{ .Values.pvc.claimName }}
   namespace: {{ .Values.namespace }}
+  annotations:
+    helm.sh/resource-policy: "keep"
 spec:
   accessModes:
-    - {{  .Values.pvc.accessMode }}
+    - {{ .Values.pvc.accessMode }}
   resources:
     requests:
       storage: {{ .Values.pvc.size }}