So after commenting out the brickserver container from the docker-compose.yml and running: sh docker/start.sh I get:
Error: '/gunicorn_conf.py' doesn't exist
So I docker exec -it brickserver /bin/bash and found the file in the container because I couldn't divine where it came from via the image...
My goal is to run the three other containers (mongo/postgres/virtuoso) as images and develop locally on the application layer. I'll post other issues I run into here hopefully to streamline the solutions eventual PR.