feat: add nix support(#80) (#82)

* feat: add nix support(#80)

* chore: nix flake update

* update actions

flake.nix

@@ -0,0 +1,58 @@
+{
+  description = "Nix Flake for lan-mouse";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+  outputs = {
+    self,
+    nixpkgs,
+    rust-overlay,
+    ...
+  }: let
+    inherit (nixpkgs) lib;
+    genSystems = lib.genAttrs [
+      "x86_64-linux"
+    ];
+    pkgsFor = system:
+      import nixpkgs {
+        inherit system;
+
+        overlays = [
+          rust-overlay.overlays.default
+        ];
+      };
+    mkRustToolchain = pkgs:
+      pkgs.rust-bin.stable.latest.default.override {
+        extensions = ["rust-src"];
+      };
+    pkgs = genSystems (system: import nixpkgs {inherit system;});
+  in {
+    packages = genSystems (system: rec {
+      default = pkgs.${system}.callPackage ./nix {};
+      lan-mouse = default;
+    });
+    homeManagerModules.default = import ./nix/hm-module.nix self;
+    devShells = genSystems (system: let
+      pkgs = pkgsFor system;
+      rust = mkRustToolchain pkgs;
+    in {
+      default = pkgs.mkShell {
+        packages = with pkgs; [
+          rust
+          rust-analyzer-unwrapped
+          pkg-config
+          xorg.libX11
+          gtk4
+          libadwaita
+          xorg.libXtst
+        ];
+
+        RUST_SRC_PATH = "${rust}/lib/rustlib/src/rust/library";
+      };
+    });
+  };
+}