Aarch64 on core-updates

[Andreas Enge]

Hello,

the dashboard is completely red for aarch64 on core-updates:
   https://ci.guix.gnu.org/eval/397792/dashboard?system=aarch64-linux
but when I follow any dependency chain, I end up with the scheduled build
of xz:
   https://ci.guix.gnu.org/build/512146/details

So I suppose that this is just a side-effect of our build farm not keeping
up on this architecture and prioritising master over core-updates?

I could build a simple profile (with the toolchain to compile Guix) on
my aarch64 machine.

Andreas