docker-compose.yml

version: '3.7'
services:
  db:
    image: postgres:12.2
    volumes:
      - db:/var/lib/postgresql/data
    environment:
      - POSTGRES_PASSWORD=${DB_PASSWORD}
      - POSTGRES_USER=${DB_USER}
      - POSTGRES_DB=${DB_NAME}
    ports:
      - 5432:5432

volumes:
  db: