multiple database for dockerized postgres

multidb-postgres-docker.sh

#!/bin/bash

for database in $(echo "$POSTGRES_MULTIPLE_DATABASES" | tr ',' ' '); do
    psql -v ON_ERROR_STOP=1 -U "$POSTGRES_USER" -h "$POSTGRES_HOST" <<EOSQL
        CREATE USER "$database";
        CREATE DATABASE "$database";
        GRANT ALL PRIVILEGES ON DATABASE "$database" TO "$database";
EOSQL
done

exit 0

multidb-postgres-docker.yml

postgres-migrate:
image: postgres:11.3
container_name: name
hostname: name
volumes:
  - "./postgres/init.sh:/init.sh"
command: bash /init.sh
restart: on-failure
environment:
  POSTGRES_HOST: "host"
  POSTGRES_USER: "user"
  PGPASSWORD: "pass"
  POSTGRES_MULTIPLE_DATABASES: comma_separated_dbs
depends_on:
  - postgres