Currently, I'm running the hollo.social server on my home Mac mini, and I'm running PostgreSQL in a Docker container, but I'm also considering pulling PostgreSQL out of the container to run other services that need to use PostgreSQL on my Mac mini.

Have any of you ever run only the RDBMS outside of a container like this?

@hongminhee yes.
But you can still using postgresql on docker for the other services that you need on your Mac.