add env var for number of nginx unit worker processes
i suspect that with asgi we'll be better off with 1 instead of 4 worker
processes - i'd like us to be able to test this per deployment via an
env var
allow asgi/wsgi to be configurable by env var
This will let us roll out asgi separate across services as we had
issues with our recordings capture pods on asgi
* Add docker image that uses nginx unit instead of gunicorn
🦄🔫
* Add unit build to CI
* Fix duplicate id
* try 3.11
* Only build for amd64
need python3.11 for unit image on arm