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ci: route private repos to the shared grounds-runners pool - #32
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The runner scale sets on hbr1 are now registered at org level, so one pool can serve every private repository instead of one scale set per repo. Private repos go to `grounds-runners`; public ones stay on GitHub-hosted runners, and the org's Default runner group refuses public repositories as a second line. A missing event payload now falls back to hosted amd64 `ubuntu-24.04` instead of the Blacksmith label, which no longer takes jobs; hosted arm64 would not do either, since it does not exist for private repos.
This was referenced Sep 30, 2026
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Do not merge until the pools
grounds-runners/grounds-runners-largeare running on hbr1, otherwise private jobs wait for a label nobody serves.github.event.repository.name→(github.event.repository.name && 'grounds-runners'). Public → hosted (unchanged); private → the shared org-level ARC pool; missing event payload → hostedubuntu-24.04.blacksmith-2vcpu-ubuntu-2404-armis replaced byubuntu-24.04(amd64, exists for public and private repos; hosted arm64 does not exist for private ones).grounds-runners-largeis available as therunnerinput for memory-hungry builds.test_every_central_workflow_routes_private_repos_to_the_shared_poolresolves all 9 jobs for private/public/no-payload; 8/8 green.Safety: the org's Default runner group is set to
allows_public_repositories=false(2026-09-30), so public repos cannot reach hbr1 even with a hand-editedruns-on.Follow-ups: repo PRs for workflows with their own labels (forge, portal, vanilla, …, and the dead
arc-linux/arc-dindlabels), then removing the per-repo scale sets.