[Merge] ~jchittum/livecd-rootfs:jammy-grub-dist-ubuntu into livecd-rootfs:ubuntu/jammy

[John Chittum]

John Chittum has proposed merging ~jchittum/livecd-rootfs:jammy-grub-dist-ubuntu into livecd-rootfs:ubuntu/jammy.

Commit message:
fix: GRUB_DISTRIBUTION for buildd
    
LP: #2034253 Grub is found to use lsb_release or default to Debian.
buildd does not have lsb_release, so Debian was the GRUB_DISTRIBUTION.
that ends up with issues with the EFI path


Requested reviews:
  Canonical Foundations Team (canonical-foundations)
Related bugs:
  Bug #2034253 in cloud-images: "Jammy buildd image doesn't boot because grub is installed to \EFI\debian instead of \EFI\ubuntu"
  https://bugs.launchpad.net/cloud-images/+bug/2034253

For more details, see:
https://code.launchpad.net/~jchittum/livecd-rootfs/+git/livecd-rootfs/+merge/450968
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