ci: fail over ubuntu sim/ut jobs to self-hosted when GitHub stalls#11
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ci: fail over ubuntu sim/ut jobs to self-hosted when GitHub stalls#11doraemonmj wants to merge 1 commit into
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When GitHub's hosted runner pool is congested, the ubuntu-latest CI legs (ut / st-sim-a2a3 / st-sim-a5) can queue for a long time. Add a single non-required, self-hosted ubuntu-fallback job that covers that rare stall without changing how CI gates: - The GitHub primaries stay the required checks and gate on their own results. - ubuntu-fallback polls the three primaries in parallel and, per leg, DEFERS the moment GitHub starts running it (exiting in seconds, so the self-hosted slot is free in the common case) and only self-runs a leg GitHub never scheduled. - On such a stall the required primary stays pending; a maintainer admin-merges using this job's green self-run. Existing jobs are unchanged; this only adds the actions:read permission and the new job. Decision logic lives in .github/scripts/ci-wait-or-fallback.sh (DEFER / SELFRUN / RENAME_ERROR; python3, no jq). Activation: register a self-hosted runner with a 'sim' label carrying GCC 15 / gtest. The job is guarded to same-repo PRs and is non-required, so without such a runner it stays queued but blocks nothing.
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Add a GitHub-first, self-hosted fallback for the ubuntu-latest legs of ut, st-sim-a2a3 and st-sim-a5. Each *-ubuntu-fallback job mirrors its GitHub leg's result and only self-runs the tests when GitHub fails to schedule the primary within a timeout, so exactly one of the two runs the tests.
Contains TEST-ONLY stall edits for the a2a3 leg to exercise the takeover path; revert them before relying on this in production.