Flake : Add template for Rust.

.config/linux/flake/template/rust.nix

@@ -0,0 +1,38 @@
+{
+	description = "Rust shell env.";
+
+	inputs = {
+		nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+	};
+
+	outputs = { self, nixpkgs } @inputs:
+		let
+			system = "x86_64-linux";
+			pkgs   = nixpkgs.legacyPackages.${system};
+			lib    = pkgs.lib;
+		in {
+			devShell.${system} = pkgs.mkShell rec {
+				nativeBuildInputs = with pkgs; [
+					cargo
+					rustc
+					rust-analyzer
+					rustfmt
+
+					cmake
+					pkg-config
+					fontconfig
+				];
+				buildInputs = with pkgs; [
+					libxkbcommon
+					wayland
+					libGL
+					xorg.libX11
+					xorg.libXrandr
+					xorg.libXinerama
+					xorg.libXcursor
+					xorg.libXi
+				];
+				LD_LIBRARY_PATH = "${lib.makeLibraryPath buildInputs}";
+			};
+		};
+}