Draft: chore: Add ARM64 support for Linux in test environment [[ON HOLD]]

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What does this MR do and why?

Adds linux-arm64 (aarch64) architecture support to the OpenBao rake task to fix test execution in GDK-in-a-box containers running on ARM64 processors.

This MR maps the 'aarch64' CPU architecture to 'arm64' and includes the SHA256 checksum for the linux-arm64 OpenBao binary. This fixes the OpenBao installation failure that was preventing RSpec tests from running in ARM64-based GDK environments.

The issue was discovered when running tests in GDK-in-a-box containers on ARM64 processors, where the OpenBao binary download would fail with a 404 error because the ARM64 architecture wasn't recognized.

🛠️ with ❤️ at Siemens

References

• Original feedback comment regarding the openbao problem: gitlab-development-kit#2035 (comment 2775064404)
• Depends on: gitlab-org/govern/secrets-management/openbao-internal!23 (merged) (must be merged first for the ARM64 binary to be available)
• Depends on !206792 as a real fix for running openbao in test environment

Screenshots or screen recordings

Not applicable for this backend change.

How to set up and validate locally

1. Ensure you're on an ARM64 Linux system (or use an ARM64 container)
2. Run the OpenBao rake task to verify it downloads the correct binary:

   bundle exec rake gitlab:secrets_management:openbao:download_or_clone[/tmp/test_openbao]

3. Verify the binary was downloaded and has the correct checksum
4. Run any RSpec test that requires OpenBao setup:

   bundle exec rspec spec/lib/gitlab/auth/oidc/step_up_auth_before_request_phase_spec.rb

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

MR Checklist (@gerardo-navarro)

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the style guides
• Conforms to the javascript style guides
• Conforms to the database guides
• Conforms to the merge request performance guidelines
• Fixes test environment setup for ARM64 architectures
• Follows existing architecture mapping pattern in the rake task