Add a nix flake

Author: Simon Inns

flake.nix

@@ -0,0 +1,58 @@
+{
+  description = "ld-decode-tools (Nix flake)";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        packages.default = pkgs.stdenv.mkDerivation {
+          pname = "ld-decode-tools";
+          version = "7.2.0";
+          src = ./.;
+
+          nativeBuildInputs = with pkgs; [
+            cmake
+            ninja
+            pkg-config
+            qt6.wrapQtAppsHook
+          ];
+
+          buildInputs = with pkgs; [
+            qt6.qtbase
+            qt6.qtsql
+            fftw
+            ffmpeg
+            sqlite
+            libGL
+          ];
+
+          cmakeBuildType = "Release";
+          cmakeFlags = [
+            "-DCMAKE_BUILD_TYPE=Release"
+          ];
+        };
+
+        devShells.default = pkgs.mkShell {
+          packages = with pkgs; [
+            cmake
+            ninja
+            pkg-config
+            qt6.qtbase
+            qt6.qtsql
+            fftw
+            ffmpeg
+            sqlite
+            libGL
+            python3
+          ];
+        };
+      }
+    );
+}