minor: built k0sctl via 'go install', 'k0sctl version' reports 0.0.0

[draeath]

Minor issue:

If you build k0sctl as instructed (tested @latest and @v0.15.0) your binary believes it's version number to be 0.0.0:

draeath@redacted:~> k0sctl version
version: 0.0.0
commit: HEAD

I don't know how one would solve this problem correctly, but an old google drive go client had an additional command you had to run to 'add' the version information to the built binary. Might be worth looking into. Here's the PR where the author implemented that for their project.

[kke]

It should be possible to figure out the absolute path of the source file with something like:

import (
	"runtime"
)

func main() {
	_, filename, _, ok := runtime.Caller(0)
}

I think that would be something like $GOPATH/foofoo/k0sctl@v0.15.0 if you installed via @v0.15.0 and maybe something like @v0.15.0-0.202312312123-3233443134413341134 if via @latest.

Maybe k0sctl could resort to doing that in case the version number buildflag was not given.

This would require changing any usages of version.Version to version.GetVersion() which would be something like:

if Version != "" {
  return Version
} else {
  return versionFromPath()
}