chore: add web-files package to flake

flake.nix

@@ -75,6 +75,36 @@
               ln -s $out/libexec/slopvivors $out/bin/slopvivors
             '';
           };
+          slopvivors_web_files = pkgs.stdenv.mkDerivation {
+            pname = "slopvivors-web-files";
+            version = "0.1.0";
+            src = ./.;
+
+            strictDeps = true;
+
+            nativeBuildInputs = with pkgs; [
+              godot
+              godot-export-templates-bin
+            ];
+
+            buildPhase = ''
+              runHook preBuild
+
+              export HOME=$(mktemp -d)
+              mkdir -p $HOME/.local/share/godot/
+              ln -s ${pkgs.godot-export-templates-bin}/share/godot/export_templates "$HOME/.local/share/godot/"
+              mkdir -p build
+
+              godot --headless --export-release Web ./build/slopvivors
+
+              runHook postBuild
+            '';
+            installPhase = ''
+              mkdir -p "$out"
+              cp ./build/* "$out"
+              mv ./build/slopvivors "$out"/index.html
+            '';
+          };
         }
       );
     };