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

Currently, there is no built-in way to run k0s controller only for the initialization phase and then exit. Users have to start k0s controller and manually terminate it after initialization if they only want to bootstrap certificates, PKI, and configurations without running the full control plane. This makes automation and pre-initialization workflows more complex than necessary.

Describe the solution you would like

It would be great to have a --init-only flag for k0s controller, which:

1. Runs only the initialization steps (certificates, PKI, configurations, etc.).
2. Exits successfully once the initialization process is complete, instead of keeping the control plane running.

This would be useful for:

• Preparing the controller node without immediately starting the full control plane.
• Automating cluster setup in CI/CD pipelines.
• Pre-generating assets before launching the full cluster in certain environments.

Describe alternatives you've considered

Running k0s controller and manually terminating it after initialization. This is not ideal as it requires additional scripting or manual intervention.

Additional context

No response