Fix authentication error in system-test

[int128]

Problem to solve

# see the setup instruction
kubectl oidc-login setup \
	--oidc-issuer-url=https://dex-server:10443/dex \
	--oidc-client-id=YOUR_CLIENT_ID \
	--oidc-client-secret=YOUR_CLIENT_SECRET \
	--oidc-extra-scope=email \
	--certificate-authority=../cert/ca.crt \
	--browser-command=/home/runner/work/kubelogin/kubelogin/bin/chromelogin
authentication in progress...
08:30:30.446683 main.go:54: location: https://dex-server:10443/dex/auth/local?req=dfeoyatqf2rz6tt4ipa4vhjjp
08:30:30.502648 main.go:89: location: https://dex-server:10443/dex/auth/local?req=dfeoyatqf2rz6tt4ipa4vhjjp [dex]
08:30:30.979216 main.go:89: location: https://dex-server:10443/dex/approval?req=dfeoyatqf2rz6tt4ipa4vhjjp [dex]
08:30:31.133477 main.go:89: location: http://localhost:8000/?code=abqsvbxq3oyzr44eajcnk3poh&state=aEkzzDvpr8YCznEcfK74BJnQoliUIuBAzqvADdEtAoM [Authenticated]

## 2. Verify authentication

You got a token with the following claims:

{
  "iss": "https://dex-server:10443/dex",
  "sub": "CiQwOGE4Njg0Yi1kYjg4LTRiNzMtOTBhOS0zY2QxNjYxZjU0NjYSBWxvY2Fs",
  "aud": "YOUR_CLIENT_ID",
  "exp": 1651998631,
  "iat": 1651912231,
  "nonce": "3khHllIDlWAnTU3SU_-0GBVh7e8uB88f1NpJkc1hdcU",
  "at_hash": "3VMEnmkrPsAPkcUrh21NYw",
  "email": "admin@example.com",
  "email_verified": true
}

## 3. Bind a cluster role

Run the following command:

	kubectl create clusterrolebinding oidc-cluster-admin --clusterrole=cluster-admin --user='https://dex-server:10443/dex#CiQwOGE4Njg0Yi1kYjg4LTRiNzMtOTBhOS0zY2QxNjYxZjU0NjYSBWxvY2Fs'

## 4. Set up the Kubernetes API server

Add the following options to the kube-apiserver:

	--oidc-issuer-url=https://dex-server:10443/dex
	--oidc-client-id=YOUR_CLIENT_ID

## 5. Set up the kubeconfig

Run the following command:

	kubectl config set-credentials oidc \
	  --exec-api-version=client.authentication.k8s.io/v1beta1 \
	  --exec-command=kubectl \
	  --exec-arg=oidc-login \
	  --exec-arg=get-token \
	  --exec-arg=--oidc-issuer-url=https://dex-server:10443/dex \
	  --exec-arg=--oidc-client-id=YOUR_CLIENT_ID \
	  --exec-arg=--oidc-client-secret=YOUR_CLIENT_SECRET \
	  --exec-arg=--oidc-extra-scope=email \
	  --exec-arg=--certificate-authority=../cert/ca.crt \
	  --exec-arg=--browser-command=/home/runner/work/kubelogin/kubelogin/bin/chromelogin

## 6. Verify cluster access

Make sure you can access the Kubernetes cluster.

	kubectl --user=oidc get nodes

You can switch the default context to oidc.

	kubectl config set-context --current --user=oidc

You can share the kubeconfig to your team members for on-boarding.
# set up the kubeconfig
kubectl config set-credentials oidc \
	--exec-api-version=client.authentication.k8s.io/v1beta1 \
	--exec-command=kubectl \
	--exec-arg=oidc-login \
	--exec-arg=get-token \
	--exec-arg=--oidc-issuer-url=https://dex-server:10443/dex \
	--exec-arg=--oidc-client-id=YOUR_CLIENT_ID \
	--exec-arg=--oidc-client-secret=YOUR_CLIENT_SECRET \
	--exec-arg=--oidc-extra-scope=email \
	--exec-arg=--certificate-authority=../cert/ca.crt \
	--exec-arg=--browser-command=/home/runner/work/kubelogin/kubelogin/bin/chromelogin
User "oidc" set.
# make sure we can access the cluster
kubectl --user=oidc cluster-info
08:30:31.571094 main.go:54: location: https://dex-server:10443/dex/auth/local?req=a4skzc2atscdvn5uymc3ejo6p
08:30:31.587480 main.go:89: location: https://dex-server:10443/dex/auth/local?req=a4skzc2atscdvn5uymc3ejo6p [dex]
08:30:31.871513 main.go:89: location: https://dex-server:10443/dex/approval?req=a4skzc2atscdvn5uymc3ejo6p [dex]
08:30:31.941143 main.go:89: location: http://localhost:8000/?code=cqopifao5dmpn2lcjmukbjed7&state=odjVXVTZHfRCwutamT_FlwuGPuNmSkophGR3VhOGeDg [Authenticated]

error: You must be logged in to the server (Unauthorized)

https://github.com/int128/kubelogin/runs/6333312005?check_suite_focus=true

How to solve

It seems the place of kubeadmConfigPatches has been moved.
https://kind.sigs.k8s.io/docs/user/configuration/#kubeadm-config-patches

[int128]

E0521 04:38:26.233498       1 authentication.go:63] "Unable to authenticate the request" err="invalid bearer token"