Grant access to Kubernetes dashboard

1. Add a user with the name user1 to dex.
2. Create a ClusterRole access-kubernetes-dashboard (you might need to add more verbs for read-write access):

apiVersion: rbac.authorization.k8s.io/v1                                                                            
kind: ClusterRole                                                                                                   
metadata:                                                                                                           
  name: access-kubernetes-dashboard                                                                                 
rules:                                                                                                              
- nonResourceURLs:                                                                                                  
  - /ops/portal/kubernetes                                                                                          
  - /ops/portal/kubernetes/**                                                                                       
  verbs:
  - get                                                                                                             
  - head

3. Create a ClusterRoleBinding access-kubernetes-dashboard-user1:

apiVersion: rbac.authorization.k8s.io/v1                                                                            
kind: ClusterRoleBinding                                                                                            
metadata:                                                                                                           
  name: access-kubernetes-dashboard-user1                                                                           
roleRef:                                                                                                            
  apiGroup: rbac.authorization.k8s.io                                                                               
  kind: ClusterRole                                                                                                 
  name: access-kubernetes-dashboard                                                                                 
subjects:                                                                                                           - apiGroup: rbac.authorization.k8s.io                                                                               
  kind: User                                                                                                        
  name: user1

4. Open Kubernetes Dashboard in a browser: https://<cluster URL>/ops/portal/kubernetes and enter credentials for user1