Allow snapshot controller to delete VolumeSnapshots

This patch allows the snapshot-controller-runner ClusterRole, bound to
the snapshot-controller Service Account, to delete VolumeSnapshot
objects. This is needed during the VolumeGroupSnapshot deletion.

Signed-off-by: Leonardo Cecchi <leonardo.cecchi@enterprisedb.com>

deploy/kubernetes/snapshot-controller/rbac-snapshot-controller.yaml

@@ -38,7 +38,7 @@ rules:
     verbs: ["patch"]
   - apiGroups: ["snapshot.storage.k8s.io"]
     resources: ["volumesnapshots"]
-    verbs: ["get", "list", "watch", "update", "patch"]
+    verbs: ["get", "list", "watch", "update", "patch", "delete"]
   - apiGroups: ["snapshot.storage.k8s.io"]
     resources: ["volumesnapshots/status"]
     verbs: ["update", "patch"]