Refactor: append --skip-javascript inline instead of mutating rails_options

Follows coderabbit's suggestion to avoid mutating the @rails_options
instance variable, preventing potential option duplication issues.

- More functional/immutable approach
- Cleaner and more explicit intent
- Prevents potential future bugs from state mutation

🤖 Generated with Claude Code
Co-Authored-By: Claude <[email protected]>

Author: ihabadham

rakelib/shakapacker_examples.rake

@@ -29,8 +29,7 @@ namespace :shakapacker_examples do # rubocop:disable Metrics/BlockLength
     task example_type.gen_task_name_short => example_type.clobber_task_name do
       puts "Running shakapacker_examples:#{example_type.gen_task_name_short}"
       mkdir_p(example_type.dir)
-      example_type.rails_options += " --skip-javascript"
-      sh_in_dir(examples_dir, "rails new #{example_type.name} #{example_type.rails_options}")
+      sh_in_dir(examples_dir, "rails new #{example_type.name} #{example_type.rails_options} --skip-javascript")
       sh_in_dir(example_type.dir, "touch .gitignore")
       sh_in_dir(example_type.dir,
                 "echo \"gem 'react_on_rails', path: '#{relative_gem_root}'\" >> #{example_type.gemfile}")