instance method add_secrets_key_file

# File railties/lib/rails/generators/rails/encrypted_secrets/encrypted_secrets_generator.rb, line 7
      def add_secrets_key_file
        unless File.exist?("config/secrets.yml.key") || File.exist?("config/secrets.yml.enc")
          key = Rails::Secrets.generate_key

          say "Adding config/secrets.yml.key to store the encryption key: #{key}"
          say ""
          say "Save this in a password manager your team can access."
          say ""
          say "If you lose the key, no one, including you, can access any encrypted secrets."

          say ""
          create_file "config/secrets.yml.key", key
          say ""
        end
      end