makefile: allow starting gunicorn with workers=N command

Makefile

@@ -144,11 +144,13 b' sh:'
 dev-srv:
 	pserve --reload .dev/dev.ini
 
+## Allows changes of workers e.g make dev-srv-g workers=2
+workers?=1
 
 .PHONY: dev-srv-g
 ## run gunicorn multi process workers
 dev-srv-g:
-	gunicorn --paste .dev/dev.ini --bind=0.0.0.0:10020 --config=.dev/gunicorn_config.py --timeout=120 --reload
+	gunicorn --paste=.dev/dev.ini --bind=0.0.0.0:10020 --config=.dev/gunicorn_config.py --timeout=120 --reload --workers=$(workers)
 
 
 # Default command on calling make