Command to start a single process from a Procfile.
start does shell variable expansion for the command string and starts the
exec. This means that the command will be the only thing
running and will receive any signals sent to it directly.
pip install start
assuming there is a
Procfile in the current directory or at the path in
PROCFILE_PATH environment variable.
web: python manage.py runserver celery: celery -a myapp