Make zrepl a conditional install.

nix/configuration/hosts/neelix/default.nix

@@ -30,4 +30,5 @@
   me.kodi.enable = true;
   me.lvfs.enable = true;
   me.sound.enable = true;
+  me.zrepl.enable = true;
 }

nix/configuration/hosts/odo/default.nix

@@ -57,4 +57,5 @@
   me.vscode.enable = true;
   me.wasm.enable = true;
   me.waybar.enable = true;
+  me.zrepl.enable = true;
 }

nix/configuration/roles/zrepl/default.nix

@@ -8,6 +8,18 @@
 {
   imports = [ ];
 
+  options.me = {
+    zrepl.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install zrepl.";
+    };
+  };
+
+  config = lib.mkIf config.me.zrepl.enable (
+    lib.mkMerge [
+      {
         services.zrepl = {
           enable = true;
           settings = {
@@ -43,3 +55,6 @@
           };
         };
       }
+    ]
+  );
+}