Sync with upstream rossjrw/pr-preview-action (84 commits)

[npwolf]

Summary

Merges 84 commits from upstream rossjrw/pr-preview-action into our fork, bringing us up to date with all upstream improvements.

Upstream features gained

Feature	Impact on Our Fork
Full architecture refactor — Logic extracted from inline action.yml into lib/main.sh, lib/generate-comment.sh, etc.	High — action.yml is completely restructured
QR codes — QR code in PR comments (enabled by default)	Medium — new feature we get for free
wait-for-pages-deployment — Wait for Pages build before posting comment	Medium — nice improvement
comment toggle — Ability to disable sticky comment	Low — additive
Custom commit messages — deploy-commit-message / remove-commit-message inputs	Low — additive
Git author config — git-config-name / git-config-email	Low — additive
pages-base-url / pages-base-path — Replaces deprecated custom-url	Medium — our code still uses custom-url
pr-number input — Override PR number	Low — additive
New output values — deployment-action, pages-base-url, preview-url, etc.	Low — additive
Bumped github-pages-deploy-action from v4.5.0 to v4.7.4	Low — dependency upgrade
Bumped sticky-pull-request-comment from v2.9.0 to v2.9.2	Low — dependency upgrade
Integration/unit tests — Full test suite added	No conflict — all new files
GITHUB_API_URL variable — Uses env var instead of hardcoded URL	Low — good for GHES

Conflict resolution

Only action.yml had conflicts. Resolved by taking upstream's restructured version and re-applying our fork's customizations:

• ssh-key input — re-added and passed through to both deploy and remove steps
• custom-header input — re-added and used as the header for sticky PR comments (both deploy and remove)
• custom-message-suffix input — re-added and passed as a new 10th argument to lib/generate-comment.sh, which was updated to render it in the deploy comment

Files changed

• action.yml — Conflict resolved with our customizations preserved on upstream's new structure
• lib/generate-comment.sh — Added custom_message_suffix (10th param) support for deploy comments
• All other files are unmodified upstream additions (new lib scripts, tests, docs, workflows)

Test plan

• Verify the action deploys a preview correctly with default settings
• Verify ssh-key passthrough works for SSH-based deployments
• Verify custom-header sets the sticky comment header correctly
• Verify custom-message-suffix appends text to the deploy comment
• Verify new upstream features (QR code, wait-for-pages-deployment) work as expected

🤖 Generated with Claude Code

[npwolf]

Opened against upstream by mistake, closing.