Allow metrics-server non-kube-system RBAC (+ClusterRole) deployment

[Rotzke]

Hi!

We have a pretty rare case in our company which is still spread across clusters out there. In a situation where you can not deploy to kube-system namespace it is not possible to deploy the chart, because metrics-server needs access to
extension-apiserver-authentication ConfigMap, thus a RoleBinding should be deployed to kube-system in order to achieve this:

charts/keda/templates/metrics-server/clusterrolebinding.yaml

Line 24 in 43b0f51

kind: RoleBinding

A possible solution here would be to add a ClusterRole with same permissions as the extension-apiserver-authentication-reader Role and make it optional if kube-system deployment is not possible. I have already forked the chart and am ready to create a MR if it could be approved. Maybe you have other suggestions, would be really glad to hear them.

Looking forward to hearing from you!

Nils.

[rupertgti]

I look forward to this improvement