chore: migrate GitHub Actions runners from ubuntu-latest to arc-runner

[shreyastelkar]

Summary

• Migrate all GitHub Actions workflow jobs from ubuntu-latest to arc-runner (self-hosted ARC runner)
• Follows the same pattern applied to altimate-ingestion in https://github.com/AltimateAI/altimate-ingestion/pull/227

Changes

Replaced ubuntu-latest → arc-runner across 2 workflow files (4 instances total):

Workflow	Jobs Updated
ci.yml	3 (build matrix, release-vsstudio-marketplace, release-openvsx-marketplace)
tests.yml	1 (test matrix)

Summary by CodeRabbit

• Chores
  • Updated CI/CD pipeline configuration to change the Linux runner used for build, test, and release jobs.
  • No changes to job logic, steps, or conditional behavior—only the execution environment was adjusted to optimize pipeline execution.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 244d1177-dcd1-4d4a-9cec-2fcb121c256b

📥 Commits

Reviewing files that changed from the base of the PR and between e1c9869 and a1c366a.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

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Walkthrough

Replaced ubuntu-latest with arc-runner in GitHub Actions workflow files: the CI build matrix and release jobs in .github/workflows/ci.yml, and the Linux matrix entry in .github/workflows/tests.yml. No other job logic or steps were modified. (≤50 words)

Changes

Cohort / File(s)	Summary
GitHub Actions — CI workflow .github/workflows/ci.yml	Swapped ubuntu-latest → arc-runner for the Linux entry in the build matrix and for release-vsstudio-marketplace / release-openvsx-marketplace jobs. No other changes to steps or conditions.
GitHub Actions — Tests workflow .github/workflows/tests.yml	Replaced ubuntu-latest with arc-runner in the test job OS matrix; macos-latest and windows-latest left unchanged. Conditional steps referencing runner.os == 'Linux' will now run on arc-runner.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested reviewers

• mdesmet

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description provides a clear summary and detailed breakdown of changes, but does not follow the repository's required template structure with sections like Overview/Problem/Solution/Checklist.	Reformat the description to follow the repository's template: add Overview (Problem/Solution), Screenshot/Demo section if applicable, How to test steps, and complete the Checklist items.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: migrating GitHub Actions runners from ubuntu-latest to arc-runner across workflows.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/migrate-runners-to-arc-runner

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