feat: add Node Readiness Controller (nrc) minikube addon

[arnab-logs]

Fixes kubernetes-sigs/node-readiness-controller#188
cc: @ajaysundark

What this PR does

This PR adds a new Minikube addon for the Node Readiness Controller (NRC).

This addon is part of enabling easier adoption and testing of NRC and enables a lifecycle-managed way to deploy NRC in Minikube using: minikube start --addons=nrc

Implementation details

• Adds new addon: nrc
• Includes:
  • NRC controller static Pod manifest
  • CRD definition for NodeReadinessRule
• Runs in kube-system namespace
• Uses control-plane co-located deployment model
• Resources are labeled with: kubernetes.io/minikube-addons: nrc

How to test

Build and start

make
./out/minikube start --addons=nrc

Verify installation

kubectl get pods -n kube-system -l component=node-readiness-controller

kubectl get crd nodereadinessrules.readiness.node.x-k8s.io

Verify scheduling (control-plane)

kubectl get pods -n kube-system -l component=node-readiness-controller -o wide

Check logs

kubectl logs -n kube-system -l component=node-readiness-controller

Disable and cleanup

./out/minikube addons disable nrc --alsologtostderr

Verify cleanup:

kubectl get pods -n kube-system -l component=node-readiness-controller
kubectl get crd nodereadinessrules.readiness.node.x-k8s.io

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[minikube-bot]

Can one of the admins verify this patch?

[ajaysundark]

/retest

[k8s-ci-robot]

@arnab-logs: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-minikube-docker-crio-linux-x86	19330c5	link	false	/test pull-minikube-docker-crio-linux-x86
pull-minikube-docker-containerd-linux-arm	19330c5	link	false	/test pull-minikube-docker-containerd-linux-arm

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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