[Bug 1861520] [NEW] Build the core18 pi generic image

[Łukasz Zemczak]

Public bug reported:

[Impact]

Currently for uc18 we build separate images per Pi flavor, e.g. pi3,
pi2, cm3. Those images are all basically identical, using one gadget and
one kernel, just different assertions. With 18.04.4 we'll be switching
to just building two flavors - a pi generic armhf and arm64 image.

[Test Case]

Run a cdimage -proposed beta-channel build of raspi3 arm64 and armhf
images, make sure images are successfully booted and the right model-
assertions are used.

To make sure there are no regressions: build a classic armhf and arm64
raspi3 image via cdimage with -proposed enabled and make sure that
builds correctly as well.

[Regression Potential]

The only possible regressions might be related to image build failures.

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

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

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

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

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

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

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

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https://bugs.launchpad.net/bugs/1861520

Title:
  Build the core18 pi generic image

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

Bug description:
  [Impact]

  Currently for uc18 we build separate images per Pi flavor, e.g. pi3,
  pi2, cm3. Those images are all basically identical, using one gadget
  and one kernel, just different assertions. With 18.04.4 we'll be
  switching to just building two flavors - a pi generic armhf and arm64
  image.

  [Test Case]

  Run a cdimage -proposed beta-channel build of raspi3 arm64 and armhf
  images, make sure images are successfully booted and the right model-
  assertions are used.

  To make sure there are no regressions: build a classic armhf and arm64
  raspi3 image via cdimage with -proposed enabled and make sure that
  builds correctly as well.

  [Regression Potential]

  The only possible regressions might be related to image build
  failures.

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