This change adds a new step to Kubernetes cluster lifecycle to install
metrics server. The installation is done by applying a slightly modified
version the official yaml file [1] of the metrics server after the
cluster is provisioned. The metrics-server then installed on one of the
control plane nodes.
This works basically by incrementing a semaphore at the beginning of the
provisioning workflow and a label hop at the wait state of
KubernetesClusterNexus.
This approach can be extended to user-selectable addons and tools in the
future.
[1]
https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
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