[Merge] ~itrue/livecd-rootfs:add-kiwi-support into livecd-rootfs:ubuntu/master

[Isaac True]

Kiwi image successfully built using livefs on Launchpad: https://launchpad.net/~nemos-team/+livefs/ubuntu/lunar/nemos/+build/430372

This is a stripped-down image without any of the advanced features that will be required by NemOS in the future (e.g. dm-crypt, dm-integrity), which don't currently seem to want to work on Launchpad due to permission problems.
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https://code.launchpad.net/~itrue/livecd-rootfs/+git/livecd-rootfs/+merge/439825
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~itrue/livecd-rootfs:add-kiwi-support into livecd-rootfs:ubuntu/master.