Default dashboard URL has changed.

[Keithsc]

Hi, We have been using this proxy for a while but just recently the default namespace for the dashboard has changed from kube-system to kubernetes-dashboard so we had to override the proxys default upstream address to find the dashboard.

We were seeing the following error.
dial tcp: lookup kubernetes-dashboard.kube-system.svc.cluster.local on 10.3.0.10:53: no such host

Just add a "upstreamURL" line to override the default upstream url as shown below.

proxy:
oidc:
redirectURL: https://your_redirect_url/
discoveryURL: https://your_discovery_url
clientID: your_client_id
clientSecret: top_secret_secret!!
upstreamURL: https://kubernetes-dashboard.kubernetes-dashboard.svc.cluster.local