nixosTests.nixos-rebuild-target-host: Explain fix for switch-to-configuration-ng

      system.build.privateKey = snakeOilPrivateKey;

      system.build.publicKey = snakeOilPublicKey;

      # needed to provide STC implementation for target

      # We don't switch on `deployer`, but we need it to have the dependencies

      # available, to be picked up by system.includeBuildDependencies above.

      system.switch.enable = true;

    };

          system.build = {

            inherit targetConfig;

          };

          system.switch.enable = true;

          networking.hostName = "target";

        }