fix missing dependency `rustc` for nixos

[Jacques-z]

Description

• I'm using unstable version of nixos and it failed to launch without pkg rustc.

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[Jacques-z]

BTW, the svgs aren't shown and TLS reported as not available with this template. Got them working by adding some shellHook:

let
  pkgs = import <nixpkgs> { };
in
pkgs.mkShell {
  nativeBuildInputs = with pkgs; [
    pkg-config
    gobject-introspection
    rustc
    cargo
    cargo-tauri
    nodejs
  ];

  buildInputs = with pkgs;[
    at-spi2-atk
    atkmm
    cairo
    gdk-pixbuf
    glib
    gtk3
    harfbuzz
    librsvg
    libsoup_3
    pango
    webkitgtk_4_1
    openssl
  ];

  shellHook =
    ''
      # for svg
      export XDG_DATA_DIRS=${pkgs.gsettings-desktop-schemas}/share/gsettings-schemas/${pkgs.gsettings-desktop-schemas.name}:${pkgs.gtk3}/share/gsettings-schemas/${pkgs.gtk3.name}:$XDG_DATA_DIRS
      # for TLS:
      export GIO_MODULE_DIR=${pkgs.glib-networking}/lib/gio/modules/
    '';
}