Need to automatically build & deploy Jekyll PRs

Has anyone ever tried making a GitHub Actions workflow that will build and deploy a PR to some temporary domain? I think that this would be very nice to quickly review PRs to the website, but I understand that we are limited by the "choose one branch" policy of GitHub pages.

We could always deploy to some different subdomain (e.g., `preview.precice.org`) via some other cloud provider, of course, but I don't know if there is enough interest for this feature to justify for it. We could also archive older versions there, if we ever wanted (e.g., to `archive.precice.org`).