helm: add secret rbac to library chart

Author: henrichter

helm/bundles/cortex-cinder/templates/rbac.yaml

@@ -51,4 +51,11 @@ rules:
   - get
   - patch
   - update
+- apiGroups: [""]
+  resources:
+  - secrets
+  verbs:
+  - get
+  - list
+  - watch
 {{- end -}}