Add loading area limit from the env file

default_settings.py

@@ -377,4 +377,4 @@ def check_oidc() -> bool:
 }
 
 # Limit maximum allowed area of an order, in square meters. 0 for unlimited
-MAX_ORDER_AREA=0
+MAX_ORDER_AREA=int(os.environ.get("MAX_ORDER_AREA", "0"))