We have matrix spots for these, so we should really automate them so @pwhalen doesn't have to sit there running them for hours.
The only potential stumbling block is disk space, in fact - I think we don't carry all the necessary base disk images for aarch64 at present, and we're kind of tight on disk space for aarch64 assets at this point. The size limit we have configured means they get garbage collected very fast, and I don't know if the prod server actually has enough disk space to bump the limit. I'll have to check how many more images we'd need to carry, and if we have room to bump the limit a bit.
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