Simplifies the Nix files

Rebuilt the flake using `fh init`. Moves the derviation inside the flake, removes unnecessary files

flake.nix

@@ -1,21 +1,61 @@
+# This flake was initially generated by fh, the CLI for FlakeHub (version 0.1.18)
 {
-  description = "A tool to configure scoped DNS resolvers on macOS";
+  # A helpful description of your flake
+  description = "Scoped DNS helper tool for macOS";
 
-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.2411.*";
+  # Flake inputs
+  inputs = {
+    flake-schemas.url = "https://flakehub.com/f/DeterminateSystems/flake-schemas/*";
 
-  outputs = { nixpkgs, ... }:
+    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/*";
+  };
+
+  # Flake outputs that other flakes can use
+  outputs = { self, flake-schemas, nixpkgs }:
     let
-      forAllSystems = gen:
-        nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed
-        (system: gen nixpkgs.legacyPackages.${system});
-    in {
-      packages = forAllSystems (pkgs: { default = pkgs.callPackage ./. { }; });
+      # Helpers for producing system-specific outputs
+      supportedSystems = [ "aarch64-darwin" ];
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+      });
+    in
+    {
+      # Schemas tell Nix about the structure of your flake's outputs
+      schemas = flake-schemas.schemas;
+
+      packages = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.stdenv.mkDerivation {
+          name = "scopeddnsutil";
+          src = ./.;
+
+          # Including SwiftPM as a nativeBuildInput provides a buildPhase for you.
+          # This by default performs a release build using SwiftPM, essentially:
+          #   swift build -c release
+          nativeBuildInputs = with pkgs; [
+            swift
+            swiftpm
+          ];
+
+          installPhase = ''
+            binPath="$(swiftpmBinPath)"
+            mkdir -p $out/bin
+            cp $binPath/scopeddnsutil $out/bin/
+          '';
+        };
+      });
 
-      devShells = forAllSystems (pkgs: {
-        default = pkgs.mkShell.override { inherit (pkgs.swiftPackages) stdenv; } {
-          buildInputs = [ pkgs.swift pkgs.swiftpm pkgs.swiftpm2nix pkgs.swiftPackages.Foundation ];
-          LD_LIBRARY_PATH = "${pkgs.swiftPackages.Dispatch}/lib";
+      # Development environments
+      devShells = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.mkShell {
+          # Pinned packages available in the environment
+          packages = with pkgs; [
+            nixpkgs-fmt
+            swift
+            swiftpm
+            swiftpm2nix
+            swiftPackages.Foundation
+          ];
         };
       });
     };
-}
+}