try fix actions kvm error

https://github.com/nix-community/nixos-generators/issues/83

test/test.nix

@@ -8,6 +8,10 @@
 
       services.malobeo-tasklist.enable = true;
       environment.systemPackages = [ pkgs.curl ];
+
+      nix.settings = {
+        system-features = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
+      };
     };
   };