There’s a nice blog post from
@big-piano-35669 on Pulumi + GitHub Actions at
https://blog.pulumi.com/continuous-delivery-to-any-cloud-using-github-actions-and-pulumi. There are links to videos and other documentation near the end of that post.
GitHub Actions itself is still in private preview, but you can sign up for the preview now. We are very excited to see it become publicly available soon - it makes integrating Pulumi into GitHub projects super simple.