[Bug 2072759] [NEW] Build ubuntu-core qcow2 images

[Łukasz Zemczak]

Public bug reported:

[Impact]

The Ubuntu Core team requests that their UC24 images are made available
for LXD consumption. For this, we need to actually generate
qcow2-formatted images for core. The best way would be doing that on the
livefs builders to try and keep the build-logic separate from the
publishing logic.

ubuntu-cdimage already supports pulling qcow2 images from builders
whenever available, since this was added for the purpose of appliances
long time ago.

[Test Case]

Build ubuntu-core images for noble with -proposed enabled. Make sure the
build doesn't fail and that it generates a qcow2 image for the non-
subarch images (amd64, arm64).

[Regression Potential]

The change is limited only to the ubuntu-core case. Worst case could be
that the build fails due to a syntax error, but this should be covered
by the test case.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Medium
     Assignee: Łukasz Zemczak (sil2100)
         Status: Fix Released

** Affects: livecd-rootfs (Ubuntu Noble)
     Importance: High
     Assignee: Łukasz Zemczak (sil2100)
         Status: In Progress

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

** Changed in: livecd-rootfs (Ubuntu Noble)
     Assignee: (unassigned) => Łukasz Zemczak (sil2100)

** Changed in: livecd-rootfs (Ubuntu Noble)
   Importance: Undecided => High

** Changed in: livecd-rootfs (Ubuntu)
   Importance: High => Medium

** Changed in: livecd-rootfs (Ubuntu)
       Status: New => Fix Released

** Changed in: livecd-rootfs (Ubuntu Noble)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/2072759

Title:
  Build ubuntu-core qcow2 images

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Noble:
  In Progress

Bug description:
  [Impact]

  The Ubuntu Core team requests that their UC24 images are made
  available for LXD consumption. For this, we need to actually generate
  qcow2-formatted images for core. The best way would be doing that on
  the livefs builders to try and keep the build-logic separate from the
  publishing logic.

  ubuntu-cdimage already supports pulling qcow2 images from builders
  whenever available, since this was added for the purpose of appliances
  long time ago.

  [Test Case]

  Build ubuntu-core images for noble with -proposed enabled. Make sure
  the build doesn't fail and that it generates a qcow2 image for the
  non-subarch images (amd64, arm64).

  [Regression Potential]

  The change is limited only to the ubuntu-core case. Worst case could
  be that the build fails due to a syntax error, but this should be
  covered by the test case.

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