PostgreSQL 13 is a powerful, open source object-relational database system. Uses official Postgres Docker image @ https://hub.docker.com/_/postgres/

Configuration
/mnt/cache/appdata/postgresql13 This is where Postgres will store it's data. For best performance, keep the files on cache drive.
Port 5432 Default connection port
POSTGRES_PASSWORD Superuser password. REQUIRED TO SET, otherwise connecting outside container will not be possible.
POSTGRES_USER Username for the superuser. Defaults to postgres if not set.
POSTGRES_DB Used to define different name for default database. Defaults to user if not set.