If using nostr for identity...

You could

1. rely on a note of a specific kind and tag being posted to nostr by allowed npubs

2. have a bot that monitors relays for those notes matching your filter

3. when a new note discovered by bot, it verify signature, check that npub on your allow list.

4. bot could then save content of note as a markdown file

5. bot then runs jekyll for that note

6. upload resulting html page to wherever you want to serve it