ci: route Linux CI to in-home ARC runner (GMF_LINUX_RUNNER) - #4
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runs-on now reads the org variable GMF_LINUX_RUNNER (=gmf-k3s) with an ubuntu-latest fallback, so non-release Linux CI runs on the Gilamonster- Foundation self-hosted runners instead of GitHub-hosted minutes — with automatic fallback to hosted if the runners are unavailable. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Routes this repo's Linux
checkjob to the org's in-home ARC runners soit stops consuming GitHub-hosted Actions minutes (nice to the shared OSS pool).
runs-on: ${{ vars.GMF_LINUX_RUNNER || 'ubuntu-latest' }}— org variableGMF_LINUX_RUNNER(=gmf-k3s) routes to self-hosted; unset → GitHub-hosted.every routed repo falls back to hosted with no code change.
Pilot for the org-wide rollout; this PR's own CI should land on a
gmf-k3srunner (nuc/nuc2), proving the routing end to end.
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