Feature Request: JSON Schema to validate k0sctl config

Hey k0sctl maintainers!

Big fan of the project, I was wondering if you'd be in having a jsonschema (https://json-schema.org/) generated and checked into the repo for the k0sctl.yaml config file.

It has integrations with a lot of tools to validate the structure of the config file and can be used by IDE's for code-completion.

There's a couple of golang libraries / build tools that could generate this for you using the go structs within the codebase: https://json-schema.org/tools?query=&sortBy=name&sortOrder=ascending&groupBy=languages&licenses=&languages=&drafts=&toolingTypes=&environments=&showObsolete=false#go

Would this be of interest to implement?

Start by locating the Go structs that define the k0sctl.yaml configuration and review the repository's current build or generation entry points. Determine how a JSON Schema could be generated and checked in, then verify that it represents the configuration structure and supports validation and IDE completion.

Written by the indexing model from the issue text.