[Bug 2110302] Re: nullboot 0.5.3 SRUs

[Michael Raymond]

Ran CPC-Azure verification with the proposed nullboot package. Launched jammy and noble pro-fde-server VMs using TDX and SEV-SNP VM sizes. Confirmed the proper installation of the proposed package, and all four VMs booted with the proposed nullboot package.
See https://warthogs.atlassian.net/browse/CPC-8710 for more detailed information.

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https://bugs.launchpad.net/bugs/2110302

Title:
  nullboot 0.5.3 SRUs

Status in nullboot package in Ubuntu:
  Invalid
Status in nullboot source package in Jammy:
  Fix Committed
Status in nullboot source package in Noble:
  Fix Committed

Bug description:
  [Impact]
  new upstream release; usual vendored dependency updates per Go MIR policy (vendor/ directory is automatically generated by go mod vendor based on go.mod).

  Targeted releases: noble, jammy

  [Test plan]
  * Test suite passes

  * Deploy Azure CVM and TPM FDE
  * Upgrade to this new package and reboot
  * Boot should be successful
  * Double check bios_measurements_log to ensure that the newly update shim was used for boot (https://github.com/canonical/tcglog-parser/tree/master/tcglog-dump can be used to extract checksum of the shim binary used at boot and compared to the one shipped in nullboot)

  * CPC - build new image with nullboot preinstalled, and attempt to
  register and boot such an images as first time.

  We have set block-proposed to allow testing in {noble,jammy}-proposed
  to be carried out before migration to  release pockets.

  [Where problems could occur]
  Resealing of Azure CVM machines could fail and they would need to be unlocked with a recovery key.

  NOTE: this bug follows precedent set by
  https://bugs.launchpad.net/ubuntu/+source/nullboot/+bug/2061754

  [Additional information]
  * Added the ability to fetch shim from previous nullboot to allow rebuilds against old shim on shim update (to avoid breakage if e-c-i wasnt updated)
  * Set disable CGo envvar because nullboot does not use any Cgo things.
  * Go version bumped to 1.22 due to Go compiler requirements in updated vendored dependencies.

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