ensure_key_files_are_ignored_silently

# File railties/lib/rails/generators/rails/encryption_key_file/encryption_key_file_generator.rb, line 49
      def ensure_key_files_are_ignored_silently(key_path, ignore: key_ignore(key_path))
        if File.exist?(".gitignore")
          unless File.read(".gitignore").include?(ignore)
            append_to_file ".gitignore", ignore
          end
        end
      end