This repo pulls data from the iNaturalist API and publishes it as an Atom feed so I can subscribe to new pelican photos in NetNewsWire.
See Building and deploying a custom site using GitHub Actions and GitHub Pages for implementation details.
I built this before I found out iNaturalist have their own Atom feeds:
https://www.inaturalist.org/observations.atom?verifiable=true&taxon_id=123829