[Merge] livecd-rootfs:xnox/mksquashfs-zstd into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

is it possible to quantify the size and speed changes for this?

Support for this compression method has been in Ubuntu kernels for quite a while, right? Obviously these squashfses are going to be mounted by the mantic kernel "for real" but it would be a bit annoying if the jammy kernel could not mount them.
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https://code.launchpad.net/~ubuntu-core-dev/livecd-rootfs/+git/livecd-rootfs/+merge/449608
Your team Ubuntu Core Development Team is requested to review the proposed merge of livecd-rootfs:xnox/mksquashfs-zstd into livecd-rootfs:ubuntu/master.