Подлючиться к запущенной БД

version: '3'
 
services:
  nginx:
    image: rodrigodiez/nginx-ssl-localhost
    ports:
      - 80:80
    volumes:
      - ./config/nginx/conf.d:/etc/nginx/conf.d
      - static_volume:/opt/services/app/static
    depends_on:
      - app
    networks:
      - nginx_network
 
  db:
    image: postgres:latest
    container_name: db
    environment:
      - POSTGRES_DB=app
      - POSTGRES_USER=user
      - POSTGRES_PASSWORD=pswd
      - POSTGRES_HOST_AUTH_METHOD=trust
      - POSTGRES_HOST=db
    networks:
      - db_network
    volumes:
      - db_volume:/var/lib/postgresql/data/
 
  app:
    restart: always
    build: .
    environment:
      - PYTHONUNBUFFERED=1
    volumes:
      - .:/opt/services/app/src
      - static_volume:/opt/services/app/static
    networks:
      - nginx_network
      - db_network
    depends_on:
      - db
    links:
      - db:db
 
networks:
  nginx_network:
    driver: bridge
  db_network:
    driver: bridge
 
volumes:
  db_volume:
  static_volume:

FROM python:3.9
 
RUN mkdir -p /opt/services/app/src
WORKDIR /opt/services/app/src
 
COPY requirements.txt /opt/services/app/src/
RUN pip install -r requirements.txt
 
COPY . /opt/services/app/src
 
RUN cd app && \
    python manage.py collectstatic --noinput && \
    python manage.py wait_for_database && \
    python manage.py makemigrations app && \
    python manage.py migrate --no-input
 
EXPOSE 80
CMD ["gunicorn", "--chdir", "app", "--bind", ":80", "app.wsgi:application"]

Waiting for database (cause: could not translate host name "db" to address: Name or service not known)

ALLOWED_HOSTS = [
    '0.0.0.0', '1.1.1.1', 'localhost', '127.0.0.1', 'db', 'nginx', 'database', 'db_network'
]
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'app',
        'USER': 'user',
        'PASSWORD': 'pswd',
        'HOST': 'db',
        'PORT': 5432, # 5432
    }
}