rumdl: disable checkPhase on Darwin (#467391)

pkgs/by-name/ru/rumdl/package.nix

@@ -2,6 +2,7 @@
   lib,
   fetchFromGitHub,
   rustPlatform,
+  stdenvNoCC,
   versionCheckHook,
   nix-update-script,
 }:
@@ -23,7 +24,9 @@ rustPlatform.buildRustPackage (finalAttrs: {
     "--bin=rumdl"
   ];
 
-  __darwinAllowLocalNetworking = true; # required for LSP tests
+  # Non-specific tests often fail on Darwin (especially aarch64-darwin),
+  # on both Hydra and GitHub-hosted runners, even with __darwinAllowLocalNetworking enabled.
+  doCheck = !stdenvNoCC.hostPlatform.isDarwin;
 
   useNextest = true;