Hi guix!

Guix System is not listed in ‘Create a Virtual Machine’ in GNOME Boxes,
which is rather absurd when GNOME Boxes has been installed via Guix
and when using Guix System.

‘Someone’ should fix this (preferably upstream, such that more people
will know about Guix), this ‘someone’ not being me, as my personal
TODO list is long enough as is.

Greetings,
Maxime.