Make allowed_host to get the value from env

sage_validation/settings.py

@@ -23,7 +23,7 @@ SECRET_KEY = os.getenv("SECRET_KEY")
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
 
-ALLOWED_HOSTS: list[str] = []
+ALLOWED_HOSTS: list[str] = os.getenv("ALLOWED_HOSTS", "").split(",")
 
 # Application definition
 INSTALLED_APPS = [