python3Packages.celery: add nixosTests.sourcehut as passthru test

sourcehut uses celery internally

pkgs/development/python-modules/celery/default.nix

@@ -19,6 +19,7 @@
 , pythonOlder
 , pytz
 , vine
+, nixosTests
 }:
 
 buildPythonPackage rec {
@@ -78,6 +79,10 @@ buildPythonPackage rec {
     "celery"
   ];
 
+  passthru.tests = {
+    inherit (nixosTests) sourcehut;
+  };
+
   meta = with lib; {
     description = "Distributed task queue";
     homepage = "https://github.com/celery/celery/";