Add nixverse command line app.

flake.nix

@@ -51,6 +51,10 @@
         system:
         let
           pkgs = nixpkgs.legacyPackages.${system};
+          pkgs' = nixverse.loadPkgs' self {
+            inherit system;
+            nixpkgs = nixpkgs-stable-nixos;
+          };
         in
         {
           default = pkgs.mkShellNoCC {

nodes/hosts/common/programs/nixverse.nix

@@ -0,0 +1,6 @@
+{ pkgs, ... }: {
+  environment.systemPackages = [
+    pkgs'.nixverse
+  ];
+}
+