update flake.nix

Author: wrjade

flake.nix

@@ -20,22 +20,20 @@
         formatter = pkgs.alejandra;
 
         devShells.default = pkgs.mkShell {
-          packages = with pkgs; [
-            # Nix development tools
-            alejandra
-            nixpkgs-fmt
+          buildInputs = with pkgs; [
+            # Basic tools
+            bash
+            coreutils
+            curl
+            gnutar
+            gzip
 
-            # Docker tools
-            dockerTools
+            # Nix tools
+            alejandra
 
-            # Python development tools
+            # Python tools
             python312
             uv
-            
-            # Build tools
-            gnutar
-            gzip
-            curl
           ];
 
           shellHook = ''