VS Code Python Django debugging in a dev container

I am developing a Python Django app in a Dockerized container. I have successfully setup remote debugging to attach to my Django server inside of a container. Me configuration is as follows.

launch.json

{
  "name": "Remote Django App",
  "type": "python",
  "request": "attach",
  "pathMappings": [
    {
      "localRoot": "${workspaceFolder}",
      "remoteRoot": "/app"
    }
  ],
  "port": 9001,
  "host": "localhost"
}

manage.py

#!/usr/bin/env python
"""Django's command-line utility for administrative tasks."""
import os
import sys


def main():
    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'llf_api.settings')
    try:
        from django.core.management import execute_from_command_line
        from django.conf import settings

        if settings.DEBUG:
          if os.environ.get('RUN_MAIN') or os.environ.get('WERKZEUG_RUN_MAIN'):
              import ptvsd
              ptvsd.enable_attach(address=('0.0.0.0', 8001))
              print("Attached remote debugger")

    except ImportError as exc:
        raise ImportError(
            "Couldn't import Django. Are you sure it's installed and ""available on your PYTHONPATH environment variable? Did you ""forget to activate a virtual environment?"
        ) from exc
    execute_from_command_line(sys.argv)


if __name__ == '__main__':
    main()

docker-compose.yml

services:
  api:
    image: ${DOCKER_IMAGE_BASE}:${DOCKER_TAG}
    build:
      context: .
      dockerfile: ./Dockerfile.development
    env_file:
      - .env
    environment:
      - DATABASE_URL=postgres://username:password@db/db_name
    volumes:
      - .:/app
    command: >
      bash -c "wait-for-it --service db:5432
      && python3 manage.py runserver 0.0.0.0:8000"
    ports:
      - "9000:8000"
      - "9001:8001"
    depends_on:
      - db
    tty: true
    stdin_open: true

The problem is that I run VS Code inside of a dev container (the Dockerfile.development above). So VS Code is essentially running within the same container the Django server is running which would make me think I need to attach to the local port (8001) the ptvsd is running on by setting my launch.json to the following:

launch.json

{
  "name": "Local Django App",
  "type": "python",
  "request": "attach",
  "host": "api",
  "port": 8001
}

However this doesn't work. When I try to attach the debugger in VS Code it appears to eventually timeout. Does anyone know how this could be accomplished?