Add a tool to apply and validate config

[petr-muller]

It's basically a kubectl apply -f directory/ --recursive that can ignore some files and distinguishes between normal and admin resources.

I dropped the initial idea of descending into directories first, because I would need to write a new filepath.Walk to do so and it does not seem worth the effort.

All admin_*.yaml files are admin resources, all remaining *.yaml files are standard resources. Files and directories starting with _ are ignored. This has an advantage of never forgetting to apply any config unless it's intentionally named with a _ prefix.

If this looks good, I'll continue with modifying Makefiles / docs / existing jobs to use it.

/cc @stevekuznetsov @bbguimaraes @hongkailiu @droslean

[stevekuznetsov]

Looks good mostly!

[stevekuznetsov]

nit: these could be

type level string

const (
    standardLevel level = "standard"
    adminLevel level = "admin"
    allLevel level = "all"
)

[petr-muller]

Yeah.

[stevekuznetsov]

doesn't this require a cfg_ prefix? README says any YAML

[petr-muller]

This regex is not used anymore, I need to remove it.

[stevekuznetsov]

Could you DRY out the walk to just take the function to call here as a parameter?

[petr-muller]

Yeah. I tried to DRY it in one of the earlier iterations, it was hard so gave up. In the current form it should not be hard anymore.

[petr-muller]

Feedback adressed, thanks!

[stevekuznetsov]

/lgtm
/approve

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