ci: replace built-in pages workflow with Node.js 24-compatible actions

[gkorland]

Summary

Replace the GitHub-managed pages-build-deployment workflow with a custom Jekyll deploy workflow that uses Node.js 24-compatible action versions, eliminating the Node.js 20 deprecation warning.

Changes

• Add .github/workflows/pages.yml — custom GitHub Pages deploy workflow
• All actions pinned to full commit SHAs (security best practice):
  • actions/checkout@v6.0.2 — Node.js 24 runtime (was @v4 / Node.js 20)
  • actions/configure-pages@v6.0.0
  • actions/jekyll-build-pages@v1.0.13 (unchanged)
  • actions/upload-pages-artifact@v5.0.0 (replaces upload-artifact@v4)
  • actions/deploy-pages@v5.0.0

Testing

The new workflow will trigger on merge to main. It replicates the exact steps of the built-in pages-build-deployment workflow using up-to-date actions.

Note: After merging, verify in Settings → Pages that the deployment source is the new custom workflow. The built-in workflow may need to be disabled from there if both run simultaneously.

Memory / Performance Impact

N/A

Related Issues

Fixes Node.js 20 deprecation warning:

Node.js 20 actions are deprecated. The following actions are running on Node.js 20: actions/checkout@v4, actions/upload-artifact@v4. Actions will be forced to run with Node.js 24 by default starting June 2nd, 2026.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 24831212-e00e-47ed-b031-33a902aae8f4

📥 Commits

Reviewing files that changed from the base of the PR and between dde8338 and c354318.

📒 Files selected for processing (1)

• .github/workflows/pages.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/update-pages-actions-node24

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