Code review comment for lp:~xnox/ubuntu-cdimage/generic-preinstalled

1)

Please edit
https://code.launchpad.net/~ubuntu-cdimage/+livefs/ubuntu/impish/cpc and change metadata to contain

"subarch": "generic"

2) Merge this branch

This will make ubuntu-cdimage build ubuntu-server daily-preinstalled images for "amd64" and "arm64" correctly, whilst utilising livecd-rootfs ubuntu-cpc project, with subarch set to make it preinstalled image instead of cloud image.

This is compatible with riscv64 and raspi images, as they all specify subarches via metadata override.