Use decouple to manage GUNICORN_WORKERS config

Author: cassymyo-spec

gunicorn.conf.py

@@ -1,8 +1,9 @@
 import os
+from decouple import config
 
 bind = "0.0.0.0:8001"
 
-workers = int(os.getenv("GUNICORN_WORKERS", "3"))
+workers = int(config("GUNICORN_WORKERS", "3"))
 
 timeout = 120