Get/Generate Admin kubeconfig with RKE2 Token over API

[splattner]

Is your feature request related to a problem? Please describe.

Currently, when doing a fully automated install for example and specially wit Terraform/OpenTofu there is no nice way to retrieve the kubeconfig file stored in /etc/rancher/rke2/rke2.yaml. There are ways using a provisioner or some 3rd party ssh provider, but I think that is not the way one should work with Terraform/OpenTofu.

Describe the solution you'd like

I'm thinking of a way to use the RKE2 Token (which I generate in Terraform and pass via CloudInit to my VM's) and then to have an API Endpoint on the rke2 register interface (port 9345) to create or get a admin kubeconfig which then can be used in further steps (e.g. installing resources using the kubernetes / helm provider).