Use ubuntu-24.04 and ubuntu-24.04-arm for all Ubuntu runners - #39
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ubuntu-latest-arm, which was on main, is not a GitHub-hosted runner label: unlike macOS, Ubuntu ARM has no -latest alias, so the aarch64 wheel job never got a runner assigned and sat queued indefinitely, blocking the release workflow. Pin every Ubuntu runner to an explicit 24.04 label rather than the floating ubuntu-latest, so x86_64 and aarch64 build on the same release and the image cannot change underneath us. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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ubuntu-latest-arm, currently onmain, is not a valid GitHub-hosted runner label, so the aarch64 wheel job never gets scheduled and the release workflow cannot complete.Unlike macOS, Ubuntu ARM has no
-latestalias. The runner-images README lists exactly three Ubuntu ARM labels:ubuntu-22.04-arm,ubuntu-24.04-armandubuntu-26.04-arm.This pins every Ubuntu runner to an explicit 24.04 label — the wheel matrix, the sdist job, the PyPI upload job, and the tox test workflow — so x86_64 and aarch64 build on the same release and the image cannot shift underneath us the way
ubuntu-latestcan.Evidence for the breakage
In run 31334533863, every other job was assigned a runner within seconds and three finished, while the ARM job sat unassigned:
By contrast
ubuntu-24.04-armwas assigned a runner and completed in 5m31s in run 31332878299 on this same repository, so ARM capacity is available — it was the label that was wrong.Why 24.04 rather than 26.04
26.04 was tried first and works for the wheel jobs, but GitHub still marks both 26.04 images as preview, and
setup-pythonhas no Python 3.9 build in its manifest for 26.04 now that 3.9 is end of life — the 3.9 test job failed immediately withFailed to resolve version ~3.9.0-0 from manifestwhile all eight other versions passed. Since the package supports 3.9, 24.04 keeps the whole matrix on one generally-available image with no special cases.Worth merging ahead of #38, which inherits the broken label from
mainand will need a rebase after this lands.🤖 Generated with Claude Code