added volumesnapshotclass to helm chart

Author: geoffrey1330

charts/latest/csi-driver-nfs/templates/snapshotclass.yaml

@@ -0,0 +1,9 @@
+{{- if .Values.externalSnapshotter.create }}
+---
+apiVersion: snapshot.storage.k8s.io/v1
+kind: VolumeSnapshotClass
+metadata:
+  name: {{ .Values.snapshotClass.name }} 
+driver:  {{ .Values.driver.name }}
+deletionPolicy: {{ .Values.snapshotClass.deletionPolicy }} 
+{{- end }}

charts/latest/csi-driver-nfs/values.yaml

@@ -147,6 +147,7 @@ externalSnapshotter:
   enabled: false
   name: snapshot-controller
   priorityClassName: system-cluster-critical
+  deletionPolicy: Delete
   controller:
     replicas: 1
   resources:
@@ -159,6 +160,11 @@ externalSnapshotter:
   customResourceDefinitions:
     enabled: true   #if set true, VolumeSnapshot, VolumeSnapshotContent and VolumeSnapshotClass CRDs will be created. Set it false, If they already exist in cluster.
 
+## SnapshotClass resource example:
+snapshotClass:
+  name: csi-nfs-snapclass
+  deletionPolicy: Delete
+  
 ## Reference to one or more secrets to be used when pulling images
 ## ref: https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/
 ##