services:
  postgres:
    image: postgres:17-alpine
    environment:
      POSTGRES_DB: ${POSTGRES_DB:?POSTGRES_DB is required}
      POSTGRES_USER: ${POSTGRES_USER:?POSTGRES_USER is required}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?POSTGRES_PASSWORD is required}
    ports:
      - "${TRESTLE_POSTGRES_PORT:-55432}:5432"
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U $$POSTGRES_USER -d $$POSTGRES_DB"]
      interval: 2s
      timeout: 3s
      retries: 20
    volumes:
      - trestle-postgres:/var/lib/postgresql/data

volumes:
  trestle-postgres: