fix: resolve extra Box options (#506)

Author: marcogermani87

src/Commands/BuildCommand.php

@@ -131,7 +131,7 @@ private function compile(string $name): BuildCommand
         $boxBinary = windows_os() ? '.\box.bat' : './box';
 
         $process = new Process(
-            [$boxBinary, 'compile', '--working-dir='.base_path(), '--config='.base_path('box.json')] + $this->getExtraBoxOptions(),
+            array_merge([$boxBinary, 'compile', '--working-dir='.base_path(), '--config='.base_path('box.json')], $this->getExtraBoxOptions()),
             dirname(__DIR__, 2).'/bin',
             null,
             null,