Provide minimal Dockerfiles and Docker compose for easy test of a local installation

[pombredanne]

This would be handy to have Dockerfiles and a docker compose way to setup the whole environment at once

[pombredanne]

See

• https://docs.docker.com/compose/django/
• https://realpython.com/django-development-with-docker-compose-and-machine/
• https://testdriven.io/blog/dockerizing-django-with-postgres-gunicorn-and-nginx/

[pombredanne]

This needs to be tested and then merged