[Bug 1829938] [NEW] [SRU] Support parallel builds for the ubuntu-cpc project

[Robert C Jennings]

Public bug reported:

[Impact]

Individual image builds need to be broken out for the ubuntu-cpc project
to allow for build parallelization.  This feature exists for eoan and
disco.

[Test Case]

Build all image targets for all architectures and ensure consistent output compared to existing build output:
* Ensure that manifests are the same before and after this change for the 'all' target
* Build all image targets:
  * Ensure that all expected hooks are run within the context of each target
  * Ensure consistent output between those individual targets and the output prior to the change

[Regression Potential]

This is not without significant risk for the ubuntu-cpc project and
requires that rigorous testing be performed to address that risk.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: New

** Merge proposal linked:
   https://code.launchpad.net/~rcj/livecd-rootfs/+git/livecd-rootfs/+merge/367715

** Merge proposal linked:
   https://code.launchpad.net/~rcj/livecd-rootfs/+git/livecd-rootfs/+merge/367716

** Merge proposal linked:
   https://code.launchpad.net/~rcj/livecd-rootfs/+git/livecd-rootfs/+merge/367717

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https://bugs.launchpad.net/bugs/1829938

Title:
  [SRU] Support parallel builds for the ubuntu-cpc project

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  [Impact]

  Individual image builds need to be broken out for the ubuntu-cpc
  project to allow for build parallelization.  This feature exists for
  eoan and disco.

  [Test Case]

  Build all image targets for all architectures and ensure consistent output compared to existing build output:
  * Ensure that manifests are the same before and after this change for the 'all' target
  * Build all image targets:
    * Ensure that all expected hooks are run within the context of each target
    * Ensure consistent output between those individual targets and the output prior to the change

  [Regression Potential]

  This is not without significant risk for the ubuntu-cpc project and
  requires that rigorous testing be performed to address that risk.

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