services:
  db:
    image: postgres:17-alpine
    restart: unless-stopped
    environment:
      POSTGRES_USER: blog
      POSTGRES_PASSWORD: blog
      POSTGRES_DB: blog
    ports:
      # Host port is configurable because 5432/5433 are often taken by local installs.
      - "${POSTGRES_PORT:-5434}:5432"
    volumes:
      - pgdata:/var/lib/postgresql/data
      # Creates the blog_test and blog_e2e databases on first startup of a fresh volume.
      - ./docker/initdb:/docker-entrypoint-initdb.d:ro
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U blog -d blog"]
      interval: 3s
      timeout: 3s
      retries: 20

volumes:
  pgdata: