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

[John Chittum]

I've tested `livecd-rootfs` from bionic proposed. It was a basic test to
ensure that

1. arm64 was selectable for buildd, and built
2. that a sample build from CPC was unaffected

I did this by

1. downloading the source package : https://launchpad.net/ubuntu/+source/livecd-rootfs/2.525.60 
2. unpacking locally
3. using https://github.com/ubuntu-bartenders/ubuntu-old-fashioned to run a buildd. command i used (utilizing an AWS based builder)

bartender --hook-extras-branch focal --livecd-rootfs-dir
/home/jchittum/dev01/troubleshooting/various-livecd-
rootfs/2.525.60/livecd-rootfs --aws-arm-build --aws-keypair-name
jchittum-cpc-jenkins --no-cleanup --aws-profile jenkins -- --series
bionic --project ubuntu-base --image-target all --subproject buildd

for the buildd

4. build completed
5. ran a CPC build to ensure it was unaffected 
bartender --hook-extras-dir ~/dev01/cloudware/cpc_packaging.extra --livecd-rootfs-dir /home/jchittum/dev01/troubleshooting/various-livecd-rootfs/2.525.60/livecd-rootfs --aws-arm-build --aws-keypair-name jchittum-cpc-jenkins -- --series bionic --project ubuntu-cpc --image-target oracle

6. Oracle build ran fine and I was able to boot it locally.

** Tags removed: verification-needed verification-needed-bionic verification-needed-focal
** Tags added: verification-done verification-done-bionic verification-done-focal

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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:
  Fix Committed
Status in livecd-rootfs source package in Focal:
  Fix Committed

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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