Hello!
It looks like the postgres image is hot-off-the-presses: #133
This has been deployed for the documentation too: https://gothenburgbitfactory.org/taskchampion-sync-server/usage/docker-images.html#:~:text=ghcr.io/gothenburgbitfactory/taskchampion%2Dsync%2Dserver%2Dpostgres%20(Postgres)
Except, we haven't tagged a new release yet, so the postgres image has not built and been tagged/pushed :o.
I would love to start playing with the pg image! I can certainly build myself to get going, but figured I'd report that the image hasn't actually been tag/push'd yet.
That could be intentional, if we're planning a bigger release too!