add rust kernel stub

flake.nix

@@ -1,16 +1,35 @@
 {
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    naersk = {
+      url = "github:nix-community/naersk";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
   outputs = {
     nixpkgs,
+    naersk,
+    rust-overlay,
     self,
     ...
   }: let
     system = "x86_64-linux";
-    pkgs = nixpkgs.legacyPackages.${system};
+    pkgs = import nixpkgs {
+      inherit system;
+      overlays = [(import rust-overlay)];
+    };
   in {
-    packages.${system}.default = pkgs.callPackage ./nix/package.nix {};
+    packages.${system} = {
+      bootler = pkgs.callPackage ./nix/pkgs/bootler.nix {};
+      bootle = pkgs.callPackage ./nix/pkgs/bootle.nix {
+        naersk = naersk;
+        bootler = self.packages.${system}.bootler;
+      };
+    };
     devShells.${system}.default = pkgs.mkShell {
       inputsFrom = [self.packages.${system}.default];
     };