Add rubocop to gemspec files

Author: Taucher2003

code0-zero_track.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.metadata['rubygems_mfa_required'] = 'true'
 
   spec.files = Dir.chdir(File.expand_path(__dir__)) do
-    Dir['{app,config,db,lib}/**/*', 'LICENSE', 'Rakefile', 'README.md']
+    Dir['{app,config,db,lib}/**/*', 'LICENSE', 'Rakefile', 'README.md', 'rubocop-zero_track.yml']
   end
 
   spec.add_dependency 'rails', '>= 8.0.1'