[Feature] replace version command with provided via kubernetes-sigs/release-utils

[developer-guy]

Current Behavior

When writing this, regctl's version command displays vcsref and vcstag in JSON by embedding this information into a binary¹. I thought we could provide much more information about the build we release.

Expected Behavior

Alternative way:
command.go#L31

Steps To Reproduce

Version

(paste output of `regctl version` or similar for binaries, or `docker image inspect regclient/...` on the image and paste the labels)

Environment

• Running as binary or container:
• Host platform:
• Registry description:

Anything else

Footnotes

1. https://github.com/regclient/regclient/blob/main/cmd/regctl/root.go#L153 ↩

[developer-guy]

I'm willing to do this, and cosign is also using the same method.

[sudo-bmitch]

I'm leaning against pulling in a k8s dependency for this, but after 1.18, the embed code can be factored back out.
https://go.dev/doc/go1.18#debug/buildinfo

I was holding back on this just in case someone was importing from an older version of Go, so I'll have a look at what k8s does for this.

Edit: it looks like k8s is using the debug/buildinfo, so I'd probably just copy what makes sense from there to avoid the dependency.