Address feedback: ubuntu-slim is a valid runner label in docs preview workflow

[Copilot]

Description

The automated Copilot reviewer incorrectly flagged ubuntu-slim as an invalid GitHub-hosted runner label in .github/workflows/schema-pr-preview.yml. This label is a valid self-hosted runner registered in the OvertureMaps org — no code change is required. This PR acknowledges the feedback, corrects the false-positive review comment, and stores the fact to prevent future incorrect flagging.

Reference

1. Original PR: [FEATURE] Docs preview for schema changes #473
2. Triggering review comment: [FEATURE] Docs preview for schema changes #473 (comment)

Testing

No functional change. The workflow already uses ubuntu-slim correctly; the runner label is confirmed valid for this org.

Checklist

1. Add relevant examples.
2. Add relevant counterexamples.
3. Update any counterexamples that became obsolete. For example, if a counterexample uses property A but is not intended to test property A's validity, and you made a schema change that invalidates property A in that counterexample, fix the counterexample to align it with your schema change.
4. Update in-schema documentation using plain English written in complete sentences, if an update is required.
5. Update Docusaurus documentation, if an update is required.
6. Review change with Overture technical writer to ensure any advanced documentation needs will be taken care of, unless the change is trivial and would not affect the documentation.

Documentation website

Docs preview for this PR.

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[github-actions]

🗺️ Schema reference docs preview is live!

🌍 Preview	https://staging.overturemaps.org/schema/pr/481/schema/index.html
🕐 Updated	Mar 23, 2026 16:20 UTC
📝 Commit	92e8d04
🔧 env SCHEMA_PREVIEW	true

Note

♻️ This preview updates automatically with each push to this PR.