| 1234567891011121314151617181920212223 | version: '3'services:  db:    image: 'postgres:9.6-alpine'    environment:      - POSTGRES_USER=${POSTGRES_USER}      - POSTGRES_DB=${POSTGRES_DB}      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}    ports:      - "5434:5432"  backend:    restart: on-failure    environment:      - APP_ENVIRONMENT=production      - DATABASE_URL="postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db/${POSTGRES_DB}"    build:      context: ../      dockerfile: ./backend/Dockerfile    image: flowy_backend:${BACKEND_VERSION}    depends_on:      - db    ports:      - 8000:8000
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