Investigate ASGI-based Django deployments

[rbreslow]

As of Django 3.0, the startproject management command sets up a default ASGI configuration. The Django docs describe ASGI as "the emerging Python standard for asynchronous web servers and applications."

Usage of ASGI and tools like Uvicorn have popped up in a few of our engagements. We should add support for ASGI-based deployments in this image.

See: https://docs.djangoproject.com/en/3.2/howto/deployment/asgi/uvicorn/

[github-actions]

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