[Bug 1827930] Re: [SRU] Please generate tarball for WSL

[Łukasz Zemczak]

Since this is verified, change small enough and only affecting image
builds, let me release this early as per uploader request.

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https://bugs.launchpad.net/bugs/1827930

Title:
  [SRU] Please generate tarball for WSL

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Xenial:
  Fix Released
Status in livecd-rootfs source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * The tarball for Ubuntu WSL Windows Store apps is repacked from the
  ${release}-server-cloudimg-amd64-root.tar.xz tarball with a few minor
  changes as part or the appx build process. Since more customization is
  planned for the WSL tarball livecd-rootfs' code is a better place for
  maintaining them.

  [Test Case]

   * Check livecd-rootfs autopkgtest output and observe the wsl tarball being generated among other non-minimal images. When building minimal images the WSL tarball should not be built.
   * Optionally use the built tarball to build the Ubuntu WSL app and verify that it can be installed on Windows 10.

  [Regression Potential]

   * Since this is a separate tarball to be built there are no expected
  regressions affecting other images.

  [Other Info]
   * At the moment only LTS releases are released to the Microsoft Store thus SRUs to Disco and Cosmic can be skipped as they won't be used. There is an ongoing discussion on whether we make Disco available or if so with which additional changes.

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