[Bug 1906805] [NEW] Create qcow2 images for ubuntu appliances (for LXD and multipass consumption)

[Łukasz Zemczak]

Public bug reported:

[Impact]

Multipass is moving to LXD for its VM needs so that the company only maintains one QEMU/KVM "wrapper" implementation. To do that without losing the appliance images, the streams need to be compatible with LXD.
For this, we want to start building qcow2 images for all the appliance images alongside of the regular 'raw' images.

[Test Case]

Run a bionic-proposed appliance livefs build (for instance, with SUBARCH
=appliance-openhab-core18-amd64), wait for the build to finish and make
sure that the list of generated/exported artifacts has a .qcow2 image in
it.

[What could go wrong]

As with any shell scripting scenario, if potentially there is a logical
bug or a syntax error in the new changes, building regular ubuntu-core
images could be broken.

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

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

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

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

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

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

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

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https://bugs.launchpad.net/bugs/1906805

Title:
  Create qcow2 images for ubuntu appliances (for LXD and multipass
  consumption)

Status in livecd-rootfs package in Ubuntu:
  Invalid
Status in livecd-rootfs source package in Bionic:
  In Progress

Bug description:
  [Impact]

  Multipass is moving to LXD for its VM needs so that the company only maintains one QEMU/KVM "wrapper" implementation. To do that without losing the appliance images, the streams need to be compatible with LXD.
  For this, we want to start building qcow2 images for all the appliance images alongside of the regular 'raw' images.

  [Test Case]

  Run a bionic-proposed appliance livefs build (for instance, with
  SUBARCH=appliance-openhab-core18-amd64), wait for the build to finish
  and make sure that the list of generated/exported artifacts has a
  .qcow2 image in it.

  [What could go wrong]

  As with any shell scripting scenario, if potentially there is a
  logical bug or a syntax error in the new changes, building regular
  ubuntu-core images could be broken.

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