update flake structure and update default.nix for production.

default.nix

@@ -1,21 +1,50 @@
 {
-  # lib,
+  lib,
   rustPlatform,
-  packageName,
+  makeWrapper,
   pkg-config,
   wayland,
   alsa-lib,
-  libudev-zero,
+  udev,
+  libxkbcommon,
+  vulkan-loader,
 }:
 rustPlatform.buildRustPackage {
-  name = "${packageName}";
+  name = "war-in-tunnels";
   src = ./.;
   buildInputs = [
     wayland
     alsa-lib
-    libudev-zero
+    udev
+    libxkbcommon
+    vulkan-loader
+  ];
+  nativeBuildInputs = [
+    makeWrapper
+    pkg-config
   ];
-  nativeBuildInputs = [ pkg-config ];
   # cargoHash = lib.fakeHash;
   cargoHash = "sha256-ZJ7DODvIiupVlmBUhQhXEVlNeDT0S62z/5Qln77JpQc=";
+  cargoBuildFlags = [
+    "--bin"
+    "war-in-tunnels"
+  ];
+  postInstall = ''
+    mkdir $out/share
+    ls
+    cp -r assets $out/share
+    wrapProgram $out/bin/war-in-tunnels --chdir $out/share
+  '';
+  postFixup = ''
+    patchelf $out/bin/.war-in-tunnels-wrapped \
+      --add-rpath ${
+        lib.makeLibraryPath [
+          vulkan-loader
+          libxkbcommon
+        ]
+      }
+  '';
+  env = {
+    ZSTD_SYS_USE_PKG_CONFIG = true;
+  };
 }