nixosTests.freetube: mark as broken on aarch64-linux

nixos/tests/freetube.nix

@@ -23,6 +23,8 @@ let
       inherit name;
       nodes = { "${name}" = machine; };
       meta.maintainers = with pkgs.lib.maintainers; [ kirillrdy ];
+      # time-out on ofborg
+      meta.broken = pkgs.stdenv.isAarch64;
       enableOCR = true;
 
       testScript = ''