Docker environnent for unit tests not working anymore

[ptrovatelli]

Bug description
The docker environment to run the unit tests is not working anymore.

Steps to reproduce

$ docker/setEnv.sh unit_tests
$ docker-compose up
Creating network "django-defectdojo_default" with the default driver
Creating django-defectdojo_rabbitmq_1 ... done
Creating django-defectdojo_mysql_1    ... done
Creating django-defectdojo_celeryworker_1 ... done
Creating django-defectdojo_celerybeat_1   ... done
Creating django-defectdojo_uwsgi_1        ... done
Creating django-defectdojo_initializer_1  ... done
Creating django-defectdojo_nginx_1        ... error

ERROR: for django-defectdojo_nginx_1  Cannot create container for service nginx: No command specified

ERROR: for nginx  Cannot create container for service nginx: No command specified
ERROR: Encountered errors while bringing up the project.
10:17:10:centos@localhost:/home/centos/django-DefectDojo
$

Expected behavior
A django with minimal configuration should start and run the unit tests

Deployment method (select with an X)

• Kubernetes
• [x ] Docker
• setup.bash / legacy-setup.bash

Environment information
dev branch

Sample scan files (optional)

Screenshots (optional)

Console logs (optional)

Additional context (optional)

I have fixed the issue in dev branch. The issue might be present in python2.7 branch too