Add OSGuard ARM64 image definition

[SeanDougherty]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

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Summary

Introduce new osguard-arm64.yaml to match the osguard-amd64.yaml that is introduced by #14439. This yaml file is expected to be used with Azure Linux Image Customizer, starting from a base image like the minimal-os base image, and will yield this new Azure Linux OS Guard image.

Requires systemd-ukify and systemd-boot.
Will not merge until #14449 is merged first.

Signed-off-by: Sean Dougherty [email protected]

Does this affect the toolchain?
NO

Associated issues
https://dev.azure.com/mariner-org/mariner/_workitems/edit/14252
Test Methodology

• Local