Add configs for a new kubernetes cluster on NixOS.

nix/kubernetes/roles/iso/default.nix

@@ -0,0 +1,22 @@
+{
+  lib,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  options.me.buildingPortable = lib.mkOption {
+    type = lib.types.bool;
+    default = false;
+    example = true;
+    description = "Whether we are building a portable image (iso/sd). This would disable CPU-specific optimizations and persistent file mounts.";
+  };
+
+  options.me.mountPersistence = lib.mkOption {
+    type = lib.types.bool;
+    default = false;
+    example = true;
+    description = "Whether we should mount persistent directories.";
+  };
+}