[Bug 1966636] Re: [FFe] Update livecd-rootfs to add arm64 bootable buildd images

[Christopher Townsend]

** Also affects: livecd-rootfs (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: livecd-rootfs (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1966636

Title:
  [FFe] Update livecd-rootfs to add arm64 bootable buildd images

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Bionic:
  New
Status in livecd-rootfs source package in Focal:
  New

Bug description:
  [ SRU TEMPLATE ]

  [Targets]
  * focal
  * bionic

  [Impact]

   * This will enable ARM bootable buildd for those suites as well.

  [Test Plan]

   * Verification can be done manually with a build from -proposed. 
   * build image using ubuntu-bartender or livecd-rootfs from $SUITE-proposed
   * manually check image by running via qemu on an arm64 system. ensure it does successfully boot
   * manually register the image with multipass on an arm64 system

  [Where problems could occur]

   * As it is a new architecture for a build, there is definitely a
  chance of differences between Ubuntu versions. However, it only  has
  the possibility of affecting buildd arm64 images.

  [Original Bug]

  The merge available here:

  https://code.launchpad.net/~saviq/livecd-rootfs/+git/livecd-
  rootfs/+merge/417034

  This doesn't affect anything existing, just adds a new architecture
  for the bootable buildd images, used through Snapcraft in Multipass.
  No impact on Ubuntu.

  Having those images will allow Snapcraft to build arm64 snaps with
  `base: core22` as soon as that's available.

  I've tested the image under Multipass on Apple M1, which will be the
  primary beneficiary.

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