Configure RBAC for cluster admin access

Grant members of the `cluster-admins` group both `cluster-reader` and
`sudoer` access. This permits members of this group to see most
cluster resources, and to impersonate other users, including the
`system:admin` user for full cluster-admin access.

From the command line, you can use the `--as` option to impersonate
the admin user:

   oc --as system:admin create ns example

cluster-scope/base/rbac.authorization.k8s.io/clusterrolebindings/cluster-admins-nerc-reader/clusterrolebinding.yaml

@@ -0,0 +1,12 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: cluster-admins-nerc-reader
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cluster-reader
+subjects:
+  - apiGroup: rbac.authorization.k8s.io
+    kind: Group
+    name: cluster-admins

cluster-scope/base/rbac.authorization.k8s.io/clusterrolebindings/cluster-admins-nerc-reader/kustomization.yaml

@@ -0,0 +1,4 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+    - clusterrolebinding.yaml

cluster-scope/base/rbac.authorization.k8s.io/clusterrolebindings/cluster-admins-nerc-sudoer/clusterrolebinding.yaml

@@ -0,0 +1,12 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: cluster-admins-nerc-sudoer
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: sudoer
+subjects:
+  - apiGroup: rbac.authorization.k8s.io
+    kind: Group
+    name: cluster-admins

cluster-scope/base/rbac.authorization.k8s.io/clusterrolebindings/cluster-admins-nerc-sudoer/kustomization.yaml

@@ -0,0 +1,4 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+    - clusterrolebinding.yaml

cluster-scope/base/user.openshift.io/groups/cluster-admins/group.yaml

@@ -0,0 +1,5 @@
+apiVersion: user.openshift.io/v1
+kind: Group
+metadata:
+  name: cluster-admins
+users: []

cluster-scope/base/user.openshift.io/groups/cluster-admins/kustomization.yaml

@@ -0,0 +1,4 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+    - group.yaml

cluster-scope/bundles/cluster-admin-rbac/kustomization.yaml

@@ -0,0 +1,6 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- ../../base/rbac.authorization.k8s.io/clusterrolebindings/cluster-admins-nerc-sudoer
+- ../../base/rbac.authorization.k8s.io/clusterrolebindings/cluster-admins-nerc-reader
+- ../../base/user.openshift.io/groups/cluster-admins

cluster-scope/overlays/common/kustomization.yaml

@@ -6,3 +6,4 @@ resources:
 - ../../base/operators.coreos.com/subscriptions/external-secrets-operator
 - ../../base/config.openshift.io/oauths/cluster
 - ../../base/rbac.authorization.k8s.io/clusterrolebindings/self-provisioners
+- ../../bundles/cluster-admin-rbac/

cluster-scope/overlays/nerc-ocp-infra/groups/cluster-admins_patch.yaml

@@ -0,0 +1,16 @@
+apiVersion: user.openshift.io/v1
+kind: Group
+metadata:
+  name: cluster-admins
+  annotations:
+    kustomize.config.k8s.io/behavior: replace
+users:
+- jtriley
+- larsks
+- tzumainn
+- chrisstafford
+- knikolla
+- aabaris
+- naved001
+- joachimweyl
+- mikthoma

cluster-scope/overlays/nerc-ocp-infra/kustomization.yaml

@@ -9,3 +9,4 @@ resources:
 
 patches:
   - path: oauths/cluster_patch.yaml
+  - path: groups/cluster-admins_patch.yaml