feat: added flake

flake.nix

@@ -0,0 +1,20 @@
+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.napalm.url = "github:nix-community/napalm";
+
+  # NOTE: This is optional, but is how to configure napalm's env
+  inputs.napalm.inputs.nixpkgs.follows = "nixpkgs";
+
+  outputs = { self, nixpkgs, napalm }:
+  let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages."${system}";
+  in {
+    # Assuming the flake is in the same directory as package-lock.json
+    packages."${system}".bnycdn = napalm.legacyPackages."${system}".buildPackage ./. { };
+
+    devShells."${system}".default = pkgs.mkShell {
+      nativeBuildInputs = with pkgs; [ nodejs ];
+    };
+  };
+}