Specifying the number of Celery workers in environment variables

[yanickrochon]

Is your feature request related to a problem? Please describe.
I simply wanted to add more workers in a prod environment, so I had to edit the docker-entrypoint.sh starting script. Then rebuild the entire container because I couldn't change that script inside the container without root privilege.

Describe the solution you'd like
Inside the .env file, have a variable defined as:

# Number of workers
CELERY_WORKERS=2

which will automatically generate the number of workers instead of having it hard-coded to 2.

Describe alternatives you've considered
Manually changing docker-entrypoint.sh and rebuilding everything.

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