i did try it:
$ sudo podman-compose up
...
MySQL Connection Error: (2002) Connection refused
...
MySQL "CREATE DATABASE" Error: Access denied for user 'admin'@'%' to database 'admin'
WARNING: unable to establish a database connection to 'db:3306'
continuing anyways (which might have unexpected results)
Yes, I’m working on fedora actually…
So, something seems to be wrong with the compose file settings. Is it copy&paste from docker-hub?