bug#63465: Error building installation image on aarch64

[Cairn]

Alright, I guess the *real* issue is in which version of the `guix` command is 
being used. I had just installed this instance of Guix using the installer 
script, so the version used for the initial pull (`/usr/local/bin/guix`) was 
still `hash`ed. Maybe another logout would have solved my issue, but is was 
able to get around it by `hash`ing `~/.config/guix/current/bin/guix`.

jpoiret helped me through this on the IRC: 
https://logs.guix.gnu.org/guix/2023-06-05.log#164216

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