include correct rust install in nix-shell

rust-toolchain.toml

@@ -1,5 +1,4 @@
 [toolchain]
-channel = "nightly-2023-11-21"
-#components = [ "rustfmt", "rustc-dev" ]
+channel = "nightly"
+date = "2023-11-21"
 targets = [ "x86_64-unknown-linux-gnu" ]
-#profile = "minimal"

shell.nix

@@ -1,25 +1,27 @@
-{ pkgs ? import <nixpkgs> { } }:
-
-with pkgs;
-
-mkShell rec {
-  nativeBuildInputs = [
-    pkg-config
-    openssl
-    wasm-pack
-    trunk
-    valgrind
-    heaptrack
-    mold
-    udev
-    lua5_4_compat
-    rustup
-  ];
-  buildInputs = [
-    udev alsa-lib libGL gcc
-    vulkan-loader vulkan-headers vulkan-tools
-    xorg.libX11 xorg.libXcursor xorg.libXi xorg.libXrandr # To use the x11 feature
-    libxkbcommon wayland # To use the wayland feature
-  ];
-  LD_LIBRARY_PATH = lib.makeLibraryPath buildInputs;
-}
+let
+  moz_overlay = import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz);
+  nixpkgs = import <nixpkgs> { overlays = [ moz_overlay ]; };
+in
+  with nixpkgs;
+  stdenv.mkDerivation rec {
+    name = "lyra_engine_dev";
+    nativeBuildInputs = [
+      pkg-config
+      openssl
+      wasm-pack
+      trunk
+      valgrind
+      heaptrack
+      mold
+      udev
+      lua5_4_compat
+      (nixpkgs.rustChannelOf { rustToolchain = ./rust-toolchain.toml; }).rust
+    ];
+    buildInputs = [
+      udev alsa-lib libGL gcc
+      vulkan-loader vulkan-headers vulkan-tools
+      xorg.libX11 xorg.libXcursor xorg.libXi xorg.libXrandr # To use the x11 feature
+      libxkbcommon wayland # To use the wayland feature
+    ];
+    LD_LIBRARY_PATH = lib.makeLibraryPath buildInputs;
+  }