问如何使用docker和nginx服务django媒体文件？

EN

STATIC_ROOT = os.path.join(BASE_DIR, 'static_cdn')
STATIC_URL = '/static/'

MEDIA_ROOT = os.path.join(BASE_DIR, 'media_cdn')
MEDIA_URL = '/media/'


STATICFILES_DIRS = (
    os.path.join(BASE_DIR, 'static'),
)

version: "3"
services:
  backend:
    image: gitrepo:latest
    #image: 731d5d7e9296
    ports:
      - 8400:8000
    links:
      - database
    command: bash -c "python manage.py migrate
      && python manage.py collectstatic --noinput
      && python manage.py runserver 0.0.0.0:8000"
    volumes:
      - media-cdn-data:/app/media_cdn
    deploy:
      restart_policy:
        condition: on-failure

    tty: true

  database:
    image: "postgres:12" # use latest official postgres version
    env_file:
      - database.env # configure postgres
    volumes:
      - database-data:/var/lib/postgresql/data/ # persist data even if container shuts down
volumes:
  database-data: # named volumes can be managed easier using docker-compose
  media-cdn-data:

server {
       server_name app.platformname.com;
             location /media/ {
                 proxy_pass http://127.0.0.1:8400/;
                 alias /app/media_cdn/;
             }
       location / {
            proxy_pass http://127.0.0.1:8400/;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
            proxy_read_timeout 3600;
            proxy_set_header Connection '';
            # these two lines here
            proxy_http_version 1.1;
        }
}