QA and armhf

[Andreas Enge <andreas@enge.fr>]

Hello,

after the core-updates merge, QA is not keeping up; on
   https://qa.guix.gnu.org/patches
I see the message
   Builds for new patch series suspended as master branch substitute availability is low for: armhf-linux 

Maybe buying new ARM machines could be part of the solution, but I also
think that armhf (and i686) should not hold up progress of Guix, or, as it
stands, risk the Guix quality since people end up pushing regardless of
the QA status (if I remember well, the manual suggests a one-week waiting
period, which right now causes frustrating busy work - create an issue,
send the patch series if there are several commits, wait a week while
knowing that QA will not handle the patch, push, close the issue).
Notice that ci has already completely dropped armhf substitutes:
   https://qa.guix.gnu.org/branch/master

Could we drop this suspension of QA depending on armhf and i686 weather
status on the master branch, and only keep it for aarch64 and x86_64?

Andreas