✨ add flake.nix

flake.nix

@@ -0,0 +1,38 @@
+{
+  description = "cutie flake ~";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    gitignore = { url = "github:hercules-ci/gitignore.nix"; flake = false; };
+    flake-utils.url = "github:numtide/flake-utils";
+    rustup.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = inputs@{ self, nixpkgs, flake-utils, rustup, ... }:
+  flake-utils.lib.eachSystem [ "x86_64-linux" ] (system: let
+    overlays = [ (import rustup) ];
+    pkgs = import nixpkgs { inherit system overlays; };
+    libPath = with pkgs; lib.makeLibraryPath [
+      libGL libxkbcommon
+      wayland wayland-utils
+      musl musl-fts musl-obstack
+      makeWrapper pkg-config gcc
+      libiconv libtool autoconf automake
+    ];
+    gitignoreSrc = pkgs.callPackage inputs.gitignore { };
+  in rec {
+    packages.hello = pkgs.callPackage ./default.nix { inherit gitignoreSrc; };
+    legacyPackages = packages;
+    defaultPackage = packages.hello;
+    devShell = pkgs.mkShell {
+      CARGO_INSTALL_ROOT = "${toString ./.}/.cargo";
+
+      RUST_SRC_PATH = "${pkgs.rustPlatform.rustLibSrc}";
+      LD_LIBRARY_PATH = libPath;
+
+      buildInputs = with pkgs; [ (rust-bin.selectLatestNightlyWith (toolchain: toolchain.complete.override {
+        targets = [ "x86_64-unknown-linux-musl" "wasm32-unknown-unknown" ];
+      })) ];
+    };
+  });
+}