bug#47841: guix foreign installer

[Vincent Legoll]

Hello,

there's a few enhancements to the installer
script waiting for review, comments and/or
merge there:

https://issues.guix.gnu.org/40601

That may make the kind of testing you've
done here easier.

The separate commits should be fairly
orthogonal and cherry-pickable independently.

I can resume working on those if there's
consensus about their usefulness.

Those patches also would probably help setting
up CI testing jobs to catch problems earlier in the release cycle.

Thanks

-- 
Vincent Legoll