Steps to run in rootless docker:

1. Copy systemd service file to default folder and run it:

cp common-compose.service ~/.config/systemd/user/
systemctl --user enable --now common-compose.service

2. Create sql file in init folder with any name, write any init code, for example:

CREATE DATABASE IF NOT EXISTS `gitea`;

CREATE USER IF NOT EXISTS 'gitea'@'%' IDENTIFIED BY 'password';
GRANT ALL ON `gitea`.* TO 'gitea'@'%';


CREATE DATABASE IF NOT EXISTS `nextcloud`;

CREATE USER IF NOT EXISTS 'nextcloud'@'%' IDENTIFIED BY 'password';
GRANT ALL ON `nextcloud`.* TO 'nextcloud'@'%';


CREATE DATABASE IF NOT EXISTS `vaultwarden`;

CREATE USER IF NOT EXISTS 'vw'@'%' IDENTIFIED BY 'password'; 
GRANT ALL ON vaultwarden.* TO 'vw'@'%';