I got Fedi support working on Ghost and decided to write up what solved the headaches I ran into.
TL:DR Simply updating the ghost container is insufficient, you need to also add their activitypub and activitypub-migrate containers to your compose file.
I may have THE definitive guide for getting activitypub to work on Ghost if you were already using docker-compose to run #Ghost.
Short and sweet, but it would have been nice if it was called out in the documentation.
TL:DR Simply updating the Ghost container is insufficient, you need to also add their activitypub and activitypub-migrate containers to you compose file.