Switch to ubuntu-slim for small CI jobs#3446
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Pull request overview
Updates the CI workflow to run smaller, lightweight jobs on GitHub Actions’ new ubuntu-slim runner (container-based 1-vCPU Linux runner) to reduce resource usage for non-heavy tasks.
Changes:
- Switch
formatjob runner fromubuntu-latesttoubuntu-slim. - Switch
tidyjob runner fromubuntu-latesttoubuntu-slim. - Switch
required(job aggregator) runner fromubuntu-latesttoubuntu-slim.
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| required: | ||
| runs-on: ubuntu-latest | ||
| runs-on: ubuntu-slim | ||
| if: ${{ always() }} |
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Switching required to ubuntu-slim increases the chance that preinstalled tooling differs from ubuntu-latest. This job’s only step pipes JSON into jq, but jq isn’t installed explicitly; if the slim runner image doesn’t include it, the workflow will fail. Consider installing jq in the job (or rewriting the check to avoid external tooling).
RyanCavanaugh
approved these changes
Apr 20, 2026
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See: https://github.blog/changelog/2025-10-28-1-vcpu-linux-runner-now-available-in-github-actions-in-public-preview/
These runners are containers with worse perf, but are good for small tasks.