feat: setup flake

flake.nix

@@ -0,0 +1,27 @@
+{
+  description = "Simple tunneler in Go that exposes local ports to the internet";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    systems = [
+      "x86_64-linux"
+      "aarch64-linux"
+      "x86_64-darwin"
+      "aarch64-darwin"
+    ];
+
+    forAllSystems = function: nixpkgs.lib.genAttrs systems (system: function nixpkgs.legacyPackages.${system});
+  in {
+    packages = forAllSystems (pkgs: rec {
+      default = trok;
+      trok = pkgs.callPackage ./default.nix {};
+    });
+
+    devShells = forAllSystems (pkgs: {
+      default = pkgs.callPackage ./shell.nix {};
+    });
+  };
+}