Fix missing CSRF settings after django 4.0 update

src/shortener/settings.py

@@ -24,6 +24,7 @@ env = environ.Env(
         "django-insecure-rk#sto!9js$j6=l+z=@g*(h8if!r(%#u(f(=k6n79d^md0b^=&",
     ),
     ALLOWED_HOSTS=(list, []),
+    CSRF_TRUSTED_ORIGINS=(list, []),
 )
 env_file = os.getenv("ENV_FILE")
 if env_file:
@@ -40,7 +41,7 @@ SECRET_KEY = env("SECRET_KEY")
 DEBUG = env("DEBUG")
 
 ALLOWED_HOSTS = env("ALLOWED_HOSTS")
-
+CSRF_TRUSTED_ORIGINS = env("CSRF_TRUSTED_ORIGINS")
 
 # Application definition