[Bug 1894824] [NEW] compare grub efi during build

[Dimitri John Ledkov]

Public bug reported:

[Impact]

 * When resigning grub in a PPA, one can satisfy the build-depends from the main Ubuntu Archive, without PPA signature ready yet.
 * In such cases, grub2-signed is missbuilt with signature from an old PPA build attached to a newer binary, resulting in validation errors.
 * Add a check to ensure that signed grub & build-depends grub are the same

[Test Case]

 * Copy grub2 from -updates into PPA and await signing
 * Copy grub2-signed from Ubuntu Archive -proposed into PPA
 * Observe that grub2-signed FTBFS, instead of successfully producing uninstallable/unverifiable debs
 * Copy grub2 from -proposed into PPA, and await signing
 * Retry grub2-signed build, which should now succeed

[Regression Potential]

 * Only a build-time quickcheck is added, without any other changes of
how signed grub efi images are assembled.

[Other Info]
 
 * Previously this issue resulted in miss built UC20 grub copies

** Affects: grub2-signed (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: grub2-signed (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: grub2-signed (Ubuntu Groovy)
     Importance: Undecided
         Status: Fix Released

** Also affects: grub2-signed (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: grub2-signed (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: grub2-signed (Ubuntu Groovy)
       Status: New => Incomplete

** Changed in: grub2-signed (Ubuntu Groovy)
       Status: Incomplete => Fix Released

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https://bugs.launchpad.net/bugs/1894824

Title:
  compare grub efi during build

Status in grub2-signed package in Ubuntu:
  Fix Released
Status in grub2-signed source package in Focal:
  New
Status in grub2-signed source package in Groovy:
  Fix Released

Bug description:
  [Impact]

   * When resigning grub in a PPA, one can satisfy the build-depends from the main Ubuntu Archive, without PPA signature ready yet.
   * In such cases, grub2-signed is missbuilt with signature from an old PPA build attached to a newer binary, resulting in validation errors.
   * Add a check to ensure that signed grub & build-depends grub are the same

  [Test Case]

   * Copy grub2 from -updates into PPA and await signing
   * Copy grub2-signed from Ubuntu Archive -proposed into PPA
   * Observe that grub2-signed FTBFS, instead of successfully producing uninstallable/unverifiable debs
   * Copy grub2 from -proposed into PPA, and await signing
   * Retry grub2-signed build, which should now succeed

  [Regression Potential]

   * Only a build-time quickcheck is added, without any other changes of
  how signed grub efi images are assembled.

  [Other Info]
   
   * Previously this issue resulted in miss built UC20 grub copies

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