feat(build): initial development nix flake (#18296)

feat(nix): initial development flake

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "Complete Open Source and Modular solution for MMO";
+
+  inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems =
+        [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin" ];
+      perSystem = { config, self', inputs', pkgs, system, ... }: {
+        devShells = {
+          default = pkgs.mkShell.override { stdenv = pkgs.clangStdenv; } {
+            nativeBuildInputs = with pkgs; [
+              boost
+              cmake
+              openssl
+              libmysqlclient
+              readline
+              bzip2
+            ];
+            MYSQL_INCLUDE_DIR = pkgs.libmysqlclient.dev + "/include/mysql";
+          };
+        };
+      };
+    };
+}