instance method ignore_key_file

# File railties/lib/rails/generators/rails/encrypted_secrets/encrypted_secrets_generator.rb, line 23
      def ignore_key_file
        if File.exist?(".gitignore")
          unless File.read(".gitignore").include?(key_ignore)
            say "Ignoring config/secrets.yml.key so it won't end up in Git history:"
            say ""
            append_to_file ".gitignore", key_ignore
            say ""
          end
        else
          say "IMPORTANT: Don't commit config/secrets.yml.key. Add this to your ignore file:"
          say key_ignore, :on_green
          say ""
        end
      end