No redaction for with values

[emirikol]

Since it's common for tools to use credentials from env variables rather than inline in commands it seems generally useful to support redaction for them as well.

I accomplished that with

  def with_redaction
    new_args = args.map{|arg| arg.is_a?(Redaction) ? '[REDACTED]' : arg }
    redacted_cmd = dup
    redacted_cmd.instance_variable_set(:@args, new_args)
    if (env = redacted_cmd.options[:env])
      redacted_env = env.transform_values { |v| v.is_a?(SSHKit::Redaction) ? '[REDACTED]' : v }
      redacted_cmd.instance_variable_set(:@options, redacted_cmd.options.merge(env: redacted_env))
    end
    redacted_cmd
  end