pushImage(url, actions = []) {
    if (!url) return this;
    const message = new ImageMessage({
      type: MESSAGE_TYPE_IMAGE,
      originalContentUrl: url,
      previewImageUrl: url,
    });
    message.setQuickReply(actions);
    this.messages.push(message);
    return this;
  }
@param {string} url
@param {Array<Command>} actions
@returns {Context}