Function database_exists stalls when inside a docker container

[brunolnetto]

I use your library to build an object for database instance on my cron-db repository. I first pass the uri with host user, password, host and port already build as it must be. It works fine when using along either local service and a dockerized database OR a local service and a local database. When I run both cron-task and database together inside a docker container, the functions database_exists stalls, and does not return a boolean value. Do you have any idea what may it be? The instructions are in the README. Feel free to ask other usage questions.

https://github.com/brunolnetto/db-cron-docker/blob/main/backend/app/database/core.py