docker-compose for Elixir project.

_docker-compose.yml

version: '3'

services:
    db:
      image: postgres:11.8-alpine
      volumes:
        - ./docker/db/init:/docker-entrypoint-initdb.d
        - ./docker/db/data:/var/lib/postgresql/data
      ports:
        - "5432:5432"
      environment:
        - POSTGRES_DEV_DB=${COMPOSE_PROJECT_NAME}_dev
        - POSTGRES_TEST_DB=${COMPOSE_PROJECT_NAME}_test
        - POSTGRES_USER=postgres
        - POSTGRES_PASSWORD=postgres

create_database.sh

POSTGRES_DEV_DB=${PROJECT_NAME}_dev
POSTGRES_TEST_DB=${PROJECT_NAME}_test

databases=(${POSTGRES_DEV_DB} ${POSTGRES_TEST_DB})

for database in ${databases[@]}; do
    psql --username postgres -c "CREATE DATABASE ${database};"
    psql --username postgres -c "GRANT ALL PRIVILEGES ON DATABASE ${database} TO postgres"
done