version: '3'

services:
  db:
    image: postgres:13  # or whichever version you prefer
    volumes:
      - postgres_data:/var/lib/postgresql/data
    environment:
      POSTGRES_DB: miniweb
      POSTGRES_USER: miniweb
      POSTGRES_PASSWORD: miniweb
    ports:
      - "5432:5432"

volumes:
  postgres_data: