cluster/simulacrum/nowhere: make optional

cluster/simulacrum/nowhere/default.nix

@@ -58,6 +58,7 @@ in
   imports = [
     ./options.nix
   ];
+  config = lib.mkIf config.nowhere.enable {
     defaults = {
       networking.hosts."${getNodeAddr "nowhere"}" = lib.attrNames config.nowhere.names;
       security.pki.certificateFiles = [
@@ -98,4 +99,5 @@ in
         }) lift.nowhere.names;
       };
     };
+  };
 }

cluster/simulacrum/nowhere/options.nix

@@ -2,6 +2,7 @@
 
 {
   options.nowhere = {
+    enable = lib.mkEnableOption "Nowhere";
     names = lib.mkOption {
       description = "Hostnames that point Nowhere.";
       type = with lib.types; attrsOf str;