Comment 0 for bug 1966636

The merge available here:

https://code.launchpad.net/~saviq/livecd-rootfs/+git/livecd-rootfs/+merge/417034

This doesn't affect anything existing, just adds a new architecture for the bootable buildd images, used through Snapcraft in Multipass. No impact on Ubuntu.

Having those images will allow Snapcraft to build arm64 snaps with `base: core22` as soon as that's available.

I've tested the image under Multipass on Apple M1, which will be the primary beneficiary.