项目树

/backend
  .env.dev
  docker-compose-dev.yml
  /project

我有以下警告：

docker-compose  -f docker-compose-dev.yml up --build # i am in the /backend directory

WARNING: The DB_USER variable is not set. Defaulting to a blank string.
WARNING: The DB_PASSWORD variable is not set. Defaulting to a blank string.
WARNING: The DB_NAME variable is not set. Defaulting to a blank string.

这意味着docker compose看不到我的环境文件。我该如何修复它？
docker-compose-dev.yml

services:
  django:
    build: ./project # path to Dockerfile
    command: sh -c " 
      sleep 3 && gunicorn -w 8 --bind 0.0.0.0:8800 core_app.wsgi"
    volumes:
      - ./project:/project
      - ./project/static:/project/static
      - ./project/media:/project/media
      - ./project/logs:/project/logs
    expose:
      - 8800
    env_file:
      - ./.env.dev
    depends_on:
      - db

  
  db:
    image: postgres:13-alpine
    volumes:
      - pg_data:/var/lib/postgresql/data/
    expose: 
      - 5432
    ports:
      - "5435:5432"
    env_file:
      - ./.env.dev
    environment:
      - POSTGRES_USER=${DB_USER}
      - POSTGRES_PASSWORD=${DB_PASSWORD}
      - POSTGRES_DB=${DB_NAME}
          .......

如何启用env文件？
P.S值在文件.env.dev中设置

DB_NAME=db_dev
DB_USER=postgres
DB_PASSWORD=passsss132132
ENV_TYPE=DEV

UPDATE发现此方法有效

docker-compose -f docker-compose-dev.yml  --env-file=.env.dev up