Separate diffuse runner used to build containers

[denis-zaitsev]

Summary

Docker publish jobs in diff-use/sampleworks were stuck waiting for a runner.

The issue started in commit 9f17fc4 (Run docker workflow on Astera builder), which changed the Docker workflow from ubuntu-latest to astera-sh-builder.

astera-sh-builder existed, but it was registered to the Astera-org GitHub org. The sampleworks repo is under diff-use, so GitHub could not match the job to that runner.

Fix

Add a new diff-use CPU runner scale set named diffuse-sh-builder in the existing arc-runners namespace.

Update the sampleworks Docker workflow to use:

runs-on: diffuse-sh-builder

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

* **Chores**
  * Updated the build workflow to use a shared runner for several container-related jobs.
  * Kept the rest of the automation unchanged, including build steps, tagging, validation, and job dependencies.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ff151950-ae83-4a55-827b-caffd3d01e79

📥 Commits

Reviewing files that changed from the base of the PR and between 2777630 and cce0eec.

📒 Files selected for processing (1)

• .github/workflows/docker.yml

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📝 Walkthrough

Walkthrough

Three jobs in .github/workflows/docker.yml—sync_checkpoints, public, and astera—have their runs-on runner changed from astera-sh-builder to diffuse-sh-builder. No other workflow logic is modified.

Changes

Docker Workflow Runner Update

Layer / File(s)	Summary
Runner label updates for all three jobs .github/workflows/docker.yml	sync_checkpoints (line 33), public (line 108), and astera (line 180) jobs switch from astera-sh-builder to diffuse-sh-builder.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• diff-use/sampleworks#251: Directly related — also modifies runner assignments for the same three jobs (sync_checkpoints, public, astera) in .github/workflows/docker.yml.

Suggested reviewers

• manzuoni-astera
• marcuscollins

🐇 Three jobs once ran on a different trail,
Now diffuse-sh-builder tips the scale!
A single runner, unified and neat,
Hop hop hop — the workflow's complete! 🎉

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is related to the change and indicates the Docker build jobs now use a separate diffuse runner.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch separate-sh-runner-for-diffuse

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