feat: expose the run id as a GitHub Actions step output

[moha-bekh]

After a successful upload on GitHub Actions, write the CodSpeed run id to $GITHUB_OUTPUT as run-id, so later workflow steps can read the run back instead of guessing it from the commit and branch.

All uploads of a workflow run land in the same CodSpeed run, so the id of the last upload is the run id. Failing to write the output only logs a warning.

The action will expose it as a run-id output once this is released.

Closes COD-3661

[codspeed]

Merging this PR will degrade performance by 17.56%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

❌ 1 regressed benchmark
✅ 32 untouched benchmarks
⏩ 4 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	WallTime	memtrack track tar	8 s	9.7 s	-17.56%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing cod-3661-expose-the-run-id-as-an-output-of-the-runner-and-the-github (9ac0bbb) with main (7c135cc)}

Footnotes

1. 4 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Adds run ID export to GitHub Actions step outputs.

The PR appears safe to merge; no outstanding findings remain.

Summary

The PR adds an opt-in run-id GitHub Actions step output after successful uploads.

• Both benchmark commands pass the option to the orchestrator.
• The GitHub Actions provider appends the uploaded run ID to GITHUB_OUTPUT; write failures produce a warning without failing the run.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[run or exec] --> B[Upload completed parts]
  B --> C[Last upload's run ID]
  C --> D{Export enabled?}
  D -- Yes --> E[Append run-id to GITHUB_OUTPUT]
  E -- Write fails --> F[Log warning; continue]

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_{Reviews (2) · Last reviewed commit: "fix: warn when the run id cannot be expo..."}