[Bug 1799773] [NEW] Accelerate the build: Drop unused checksum generation

[Robert C Jennings]

Public bug reported:

[Impact]

 * Image builds take time
 * Some of the time is spent computing checksums
 * Those checksums are never used
 * Time and energy is wasted
 * build/(md5|sha256)sum.txt is not used by livecd-rootfs and not exposed by launchpad-buildd

[Test Case]

 * Build images
 * Disable checksums
 * Build images
 * Ensure image deliverables are unchanged 

[Regression Potential]

 * Someone was using the checksums outside of launchpad-buildd; because
launchpad-buildd doesn't present those artifacts

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

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https://bugs.launchpad.net/bugs/1799773

Title:
  Accelerate the build: Drop unused checksum generation

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  [Impact]

   * Image builds take time
   * Some of the time is spent computing checksums
   * Those checksums are never used
   * Time and energy is wasted
   * build/(md5|sha256)sum.txt is not used by livecd-rootfs and not exposed by launchpad-buildd

  [Test Case]

   * Build images
   * Disable checksums
   * Build images
   * Ensure image deliverables are unchanged 

  [Regression Potential]

   * Someone was using the checksums outside of launchpad-buildd;
  because launchpad-buildd doesn't present those artifacts

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