Golang go-updates feature branch?

[Leo Famulari]

Hello!

Now that our build farm is running smoothly, I propose we revive the
practice of feature branches, when appropriate.

The first one that I propose is a go-updates branch, where we update the
Go compilers. This will affect ~500 packages.

If I understand correctly, Go is a relatively self-contained reverse
dependency graph within Guix and thus a good candidate for this
approach. It contains the Go libaries, and then some end-user
applications, and they don't really affect other packages. So, it should
be easy to understand when the update is ready to push.

I can set up a jobset on ci.guix.gnu.org if people like the idea.

Leo