meta: support nix flake for buliding

Signed-off-by: Vincenzo Palazzo <[email protected]>

Author: vincenzopalazzo

.nix/shell.nix

@@ -0,0 +1,44 @@
+{
+  description = "A rewriating of lnprototest library for black box testing of the lightning network protocol";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-24.05-darwin";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ ];
+        };
+      in
+      {
+        packages = {
+          default = pkgs.gnumake;
+        };
+        formatter = pkgs.nixpkgs-fmt;
+
+        devShell = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            # build dependencies
+            sqlite
+            curl
+            jdk
+
+            pkg-config
+            ncurses
+            stdenv.cc.cc.lib
+
+            git
+          ];
+
+          shellHook = ''
+             # FIXME: this need to go in a build task
+            ./gradlew linuxX64DistZip
+          '';
+        };
+      }
+    );
+}