Reporting this from my local installs of GNU Cuirass, though a cursory glance at
ci.guix.gnu.org (likely) shows the same issue:

GNU Cuirass currently reports both `armhf-linux` and `arm64-linux` targets as
`armhf-linux` on the web interface.

This is not only incorrect, but potentially confusing to newcomers: I have spent
some free time in the last week or two (after purchasing an MNT Reform) trying
to get my home server to build packages for deployment on an ARM-based laptop. I
only discovered that I was targeting the 32-bit version of ARM after asking on
IRC (and then looking through the logs:
https://logs.guix.gnu.org/guix/2022-04-11.log#221203 or thereabouts, where
vagrantc mentions `armhf` as suffering bitrot and goes on to mention both
`aarch64` and `arm64` in another sentence).

This is not helped by the Documentation
(https://guix.gnu.org/cuirass/manual/cuirass.html#Specifications) not giving any
examples of supported platforms, highly-search-engine-ranked issues and blog
posts (https://issues.guix.gnu.org/54055 and
https://guix.gnu.org/en/blog/2021/cuirass-10-released/ for instance, both
front-page google) only mentioning `armhf-linux`, and all running instances of
GNU Cuirass not even listing `arm64-linux` as an option.

When I have time (I am out of town for the rest of the week) I will try to
submit a patch for the documentation to list the available targets. Changing the
UI is more complex (though wider-reaching) and a bit more out of my
wheelhouse. Help there would be appreciated.

--

Christopher Rodriguez