Add GitHub Actions workflow for deploying PR previews

[jwindhager]

This PR adds a GHA workflow for automatically deploying PR previews using https://github.com/marketplace/actions/deploy-pr-preview

[github-actions]

PR Preview Action v1.6.2
Preview removed because the pull request was closed.
2025-10-09 11:18 UTC

[mahesh-panchal]

Is this publishing the preview to the gh-pages branch? That's currently where the site is hosted from, so wouldn't that mean the public would always see the latest preview?

[jwindhager]

Yes, it is, but to the pr-preview path (see #125 (comment), for example). Still public, but not linked from the root deployment. The Training-Tech-shorts repo is public, so I personally wouldn't see an issue with that.

[mahesh-panchal]

The action says it doesn't work from forks. Is there a solution for that?

[jwindhager]

Yes, I mentioned this limitation in #123 (comment). There is no solution as of now, as far as I can tell, but they are working on it. IMO, still an improvement to have this. If people want to use this feature, they need to work in the repo; PRs from forks still work, just without the preview feature then.

[mahesh-panchal]

Agreed. It's better to have some preview if possible. Since it's in a subdirectory that's better. I was under the initial impression that it the latest preview might end up being the actual site, but that's not the case.

I'll squash merge this.