gixy: pass‐through nginx tests

These exercise Gixy through the NixOS nginx module.

pkgs/tools/admin/gixy/default.nix

@@ -3,6 +3,7 @@
   fetchFromGitHub,
   fetchpatch2,
   python3,
+  nginx,
 }:
 
 let
@@ -57,6 +58,10 @@ python.pkgs.buildPythonApplication rec {
 
   pythonRemoveDeps = [ "argparse" ];
 
+  passthru = {
+    inherit (nginx.passthru) tests;
+  };
+
   meta = {
     description = "Nginx configuration static analyzer";
     mainProgram = "gixy";