[Merge] ~rmartin013/livecd-rootfs:ubuntu/jammy into livecd-rootfs:ubuntu/jammy

[Nicolas Dechesne]

Thanks for your review. This is about building UC22 images, this is where/how we set MODEL env var which is used for that.


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https://code.launchpad.net/~rmartin013/livecd-rootfs/+git/livecd-rootfs/+merge/466187
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