kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: rbac-namespace-role 
rules:  
  - apiGroups: [""] 
    resources: ["namespaces"]
    verbs: ["list"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: rbac-default-role-binding
subjects:
  - kind: ServiceAccount
    name: rbac-service-account       
    namespace: rbac-namespace 
roleRef:
  kind: ClusterRole
  name: rbac-namespace-role
  apiGroup: rbac.authorization.k8s.io