Improve support for Nix dev shell

flake.nix

@@ -24,6 +24,8 @@
         base = pkgs.callPackage ./editor.nix (inputs // {inherit system;});
         default = base;
       };
+
+      devShells.default = pkgs.callPackage ./shell.nix {inherit system;};
     })
     // {
       nixosModules = rec {

shell.nix

@@ -0,0 +1,9 @@
+{pkgs, ...}:
+pkgs.mkShell {
+  name = "base-game-engine-development-shell";
+
+  nativeBuildInputs = [pkgs.gradle_7];
+
+  LD_LIBRARY_PATH = with pkgs; "${xorg.libXtst}/lib:${openjfx17}/lib:${glib.out}/lib:${alsa-lib}/lib:${libGL}/lib:${gtk3}/lib";
+  PROTOBUF_EXECUTABLE = "${pkgs.protobuf_21}/bin/protoc";
+}