Rewrite to use nixpkgs

flake.nix

@@ -1,13 +1,29 @@
 {
   description = "Google Photo Uploader";
 
-  inputs = { gomod2nix.url = "github:nix-community/gomod2nix"; };
-
-  outputs = { self, gomod2nix, ... }: {
-    packages = rec {
-      default = google-photo-uploader;
-      google-photo-uploader =
-        import ./google-photo-uploader.nix { inherit gomod2nix; };
-    };
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-23.11";
+    gomod2nix.url = "github:nix-community/gomod2nix";
+    utils.url = "github:numtide/flake-utils";
   };
+
+  outputs = { self, gomod2nix, nixpkgs, utils, ... }:
+    utils.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [
+            (self: super: {
+              buildGoApplication =
+                gomod2nix.packages."${system}".buildGoApplication;
+            })
+          ];
+        };
+      in {
+        packages = rec {
+          default = google-photo-uploader;
+          google-photo-uploader =
+            pkgs.callPackage ./google-photo-uploader.nix { };
+        };
+      });
 }

google-photo-uploader.nix

@@ -1,9 +1,6 @@
-{ gomod2nix }:
-
 { config, lib, pkgs, ... }:
 
-let buildGoApplication = gomod2nix.packages."${pkgs.system}".buildGoApplication;
-in buildGoApplication rec {
+pkgs.lib.buildGoApplication rec {
   pname = "google-photo-uploader";
   version = "1.6.1";