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Pin GitHub Actions runner images - #81
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Replace floating runner labels with the images they resolve to today (`ubuntu-latest` -> `ubuntu-24.04`), so OS upgrades happen in an explicit change instead of whenever GitHub moves a `-latest` label. GitHub moves `ubuntu-latest` to Ubuntu 26.04 between Oct 19 and Nov 19, 2026.
pront
approved these changes
Oct 5, 2026
guilload
approved these changes
Oct 5, 2026
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Replaces floating runner labels with the images they resolve to today (
ubuntu-latesttoubuntu-24.04). OS upgrades then happen in an explicit change instead of whenever GitHub moves a-latestlabel. GitHub movesubuntu-latestto Ubuntu 26.04 between Oct 19 and Nov 19, 2026, and this keeps CI on 24.04 until we choose to move.Testing: each pinned label is the image its
-latestlabel runs on today, confirmed from recent job logs, so CI behavior doesn't change. This PR's own CI runs on the pinned labels.