helm: support encryption config in ceph-csi-cephfs chart

this chart currently lack the ability to properly configure encryption,
as well as granting sufficent permission to allow controllers to access
secret when needed.

Signed-off-by: Antoine C <hi@acolombier.dev>

charts/ceph-csi-cephfs/templates/nodeplugin-clusterrole.yaml

@@ -3,6 +3,7 @@ kind: ClusterRole
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: {{ include "ceph-csi-cephfs.nodeplugin.fullname" . }}
+  namespace: {{ .Release.Namespace }}
   labels:
     app: {{ include "ceph-csi-cephfs.name" . }}
     chart: {{ include "ceph-csi-cephfs.chart" . }}
@@ -14,10 +15,14 @@ rules:
   - apiGroups: [""]
     resources: ["nodes"]
     verbs: ["get"]
+  # allow to read Vault Token and connection options from the Tenants namespace
   - apiGroups: [""]
     resources: ["configmaps"]
     verbs: ["get"]
+{{- if and .Values.encryptionKMSConfig .Values.encryptionKMSConfig.secretNamespace (not (eq .Values.encryptionKMSConfig.secretNamespace .Release.Namespace)) }}
+  # allow to read the encryption key used with the metadata KMS
   - apiGroups: [""]
     resources: ["secrets"]
     verbs: ["get"]
 {{- end -}}
+{{- end -}}