[farhadrgh]

Summary

Run the full GPU regression workflow daily at 09:23 UTC, including when there are no new commits. The existing workflow builds the CI image and runs pytest plus the two-GPU context-parallel tests. Scheduled runs now fail if fewer than two GPUs are visible, and use a separate concurrency group so they cannot replace pending push or manual runs.

Test plan

• All repository pre-commit hooks pass on all files.
• actionlint 1.7.12 passes with the custom runner labels declared.
• Sixteen executed shell scenarios cover scheduled scope selection, existing PR behavior, GPU counts, distributed-test invocation, and failure propagation.
• Independent review found no correctness or regression issues.
• Full GPU execution on the self-hosted runner (PR CI).

No new permanent tests are needed for this workflow-only change. No public Python symbols or documentation APIs changed.

Activation

The nightly schedule becomes active after merge into main. Existing hourly runner heartbeat and watchdog workflows remain in place. GitHub can disable public-repository schedules after 60 days without repository activity; scheduled execution is not a guaranteed resource-retention mechanism.

Review

Codeowner approval is required by the repository ruleset.

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