Change dev environment setup to use postgresql

- sqlite causes too many errors
- fix requirements file
- fixes for docker setup
- A lot of concurrency issues
- Bite the bullet, time to go!

docker/requirements.txt

@@ -4,13 +4,9 @@
 setuptools>=57.4.0
 wheel>=0.37.0
 invoke>=1.4.0                   # Invoke build tool
-gunicorn>=20.1.0                # Gunicorn web server
 
 # Database links
 psycopg2>=2.9.1
 mysqlclient>=2.0.3
 pgcli>=3.1.0
 mariadb>=1.0.7
-
-# Cache
-django-redis>=5.0.0