Document rossjrw/pr-preview-action for GitHub Pages PR previews

[Copilot]

Adds rossjrw/pr-preview-action to the PR comment automation comparison section. This action deploys preview builds to GitHub Pages and is already used in this repository's .github/workflows/preview.yml.

Changes

• New action profile covering deployment lifecycle, preview URLs, and cleanup behavior
• Selective cleanup pattern highlighted with example showing how to preserve merged PR previews while removing unmerged ones:

# Deploy on open/update
- uses: rossjrw/pr-preview-action@v1
  if: contains(['opened', 'reopened', 'synchronize'], github.event.action)
  with:
    source-dir: ./docs/
    action: deploy

# Remove only unmerged PRs on close
- uses: rossjrw/pr-preview-action@v1
  if: github.event.action == "closed" && !github.event.pull_request.merged
  with:
    action: remove

• Comparison table extended with pr-preview-action features (Pages deployment, QR codes, selective cleanup)
• Usage guidance added to "Choosing the Right Action" section

Links to upstream documentation for the selective cleanup pattern.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>summarize and link to https://github.com/rossjrw/pr-preview-action</issue_title>
<issue_description>especially https://github.com/rossjrw/pr-preview-action?tab=readme-ov-file#only-remove-previews-for-unmerged-prs</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes summarize and link to https://github.com/rossjrw/pr-preview-action #200

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[github-actions]

PR Preview Action v1.8.1-1-g6f3a89d
🚀 View preview at https://UCD-SERG.github.io/lab-manual/pr-preview/pr-201/
Built to branch gh-pages at 2026-02-02 03:43 UTC. Preview will be ready when the GitHub Pages deployment is complete.