[Merge] ~xnox/livecd-rootfs:backport-snap-prebake into livecd-rootfs:ubuntu/focal

[Robert C Jennings]

It's going to take a bit of time to verify this for focal cloud images across all the clouds.  I'm going to build a package recipe using your branch and we'll build images from that to check things out.  I can give you feedback when that is complete without blocking -proposed for an extended period.  Thoughts?
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https://code.launchpad.net/~xnox/livecd-rootfs/+git/livecd-rootfs/+merge/391196
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~xnox/livecd-rootfs:backport-snap-prebake into livecd-rootfs:ubuntu/focal.