[Bug 2076929] [NEW] [SRU] Rebuild cd-boot-images-{amd64, arm64} against new shim and grub

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You have been subscribed to a public bug by Mate Kukri (mkukri):

[ Impact ]

 * Microsoft is rolling out SBAT revocations via Windows update such that
   single-boot machines with Windows won't be able to boot shim executables
   with SBAT level less than shim,4.

 * For the 22.04.5 media we would like to include the 15.8 shim so that
   it is bootable on such machines.

[ Test Plan ]

 * Ensure that the resulting cd-boot images contain our 15.8-0ubuntu1 MS UEFI
   CA signed shim executable.

[ Where problems could occur ]

 * Impact is limited to media built using the new cd-boot images which will go
   through the usual rigorous QA process.

 * The shim and grub that will be used as part of this process will be in the Jammy
   archive before being part of media.

** Affects: cd-boot-images-amd64 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: cd-boot-images-arm64 (Ubuntu)
     Importance: Undecided
         Status: New

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[SRU] Rebuild cd-boot-images-{amd64,arm64} against new shim and grub
https://bugs.launchpad.net/bugs/2076929
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