fix: settings && update readme

src/manage.py

@@ -6,7 +6,8 @@ import sys
 
 def main():
     """Run administrative tasks."""
-    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "project_name.settings")
+    APP_ENV = os.getenv("APP_ENV", "dev")
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", f"project_name.settings.{APP_ENV}")
     try:
         from django.core.management import execute_from_command_line
     except ImportError as exc:

src/project_name/asgi.py

@@ -11,6 +11,7 @@ import os
 
 from django.core.asgi import get_asgi_application
 
-os.environ.setdefault("DJANGO_SETTINGS_MODULE", "project_name.settings")
+APP_ENV = os.getenv("APP_ENV", "dev")
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", f"project_name.settings.{APP_ENV}")
 
 application = get_asgi_application()

src/project_name/celery.py

@@ -4,7 +4,8 @@ from celery import Celery
 from celery.schedules import crontab
 
 # Set the default Django settings module for the 'celery' program.
-os.environ.setdefault("DJANGO_SETTINGS_MODULE", "project_name.settings.dev")
+APP_ENV = os.getenv("APP_ENV", "dev")
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", f"project_name.settings.{APP_ENV}")
 
 app = Celery("project_name")
 

src/project_name/wsgi.py

@@ -11,6 +11,7 @@ import os
 
 from django.core.wsgi import get_wsgi_application
 
-os.environ.setdefault("DJANGO_SETTINGS_MODULE", "project_name.settings.dev")
+APP_ENV = os.getenv("APP_ENV", "dev")
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", f"project_name.settings.{APP_ENV}")
 
 application = get_wsgi_application()