Let's make the automatic "PR Preview" comment easy to integrate with any repo:

Currently it's a custom wordpress-develop GitHub workflow. It should be reusable with some manual copy&paste&adjust work. I'd love to turn it into a GitHub App that could be installed in any repo and configured with an artifact name and a default message. It would help many WordPress ecosystem projects.

Here's some inspiration to reuse:

• Docs: How to add Pull Request previews to your repository? #1237
• Pull Request previewer for all WordPress projects #696
• Auto-post a Playground preview link on every PR gutenberg#60795
• https://github.com/Automattic/themes/blob/trunk/.github/workflows/preview-theme.yml
• https://github.com/WordPress/blueprints/blob/trunk/.github/workflows/preview-comment.yml

cc @ockham @ndiego