Docker-compose + Nextcloud boost?

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I started with LSIO's container, couldn't get that to run with postgres, so went with the official container. Kept getting "user already has data" despite removing all traces, renaming the database + db container, etc...

My last attempt, I decided to do something a bit different and instead of a) specifying a user for the containers and b) mounting a main folder inside my nextcloud folder in my docker volume (holds all my persistent docker container configs), I tried using the nextcloud folder itself as the /var/www/html mount. Lo and behold, that bastard overwrote everything in that folder, including my compose file.

So I'm back at square one.

Here's the file I'm going to emulate, though just the first three services -- postgres, redis, and Nextcloud. I already run swag, don't need the others (but might need help on how to enable things like LibreOffice or other tools that might be worthwhile). My main concern is the calendaring function, though I'm not sure it's going to suit my needs. I just need to stand it up to try...

Anybody running something similar? Care to share?