ci: use pre-built AMI for arm64 CI and skip redundant setup#6898
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joseph-isaacs merged 2 commits intodevelopfrom Mar 12, 2026
Merged
ci: use pre-built AMI for arm64 CI and skip redundant setup#6898joseph-isaacs merged 2 commits intodevelopfrom
joseph-isaacs merged 2 commits intodevelopfrom
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RunsOn reads config from the default branch (develop) for public repos. Add _extends to inherit runner config from .github-private and pin arm64 AMI for prebuilt image testing. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Use the custom `ubuntu24-full-arm64-pre` image (defined in the private runs-on config) for the arm64 test runner. Skip setup-rust and nextest install since they are pre-built in the AMI. Add a setup-prebuild action to configure and start sccache on pre-built runners. Signed-off-by: Joe Isaacs <joe.isaacs@live.co.uk>
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Summary
Use the custom
ubuntu24-full-arm64-preAMI image for the arm64 test runner, which has the Rust toolchain and nextest pre-installed.Changes:
image=ubuntu24-full-arm64-preto the arm64 runner config in CIsetup-rustandnextestinstall steps for arm64 (already in the AMI)fallback_runnerfor arm64 (not needed since forks don't use runs-on runners)Testing
CI will validate the arm64 tests run correctly with the pre-built AMI.