code: func (api *Client) PostEphemeralContext(ctx context.Context, channelID, userID string, options ...MsgOption) (timestamp string, err error) {
  	_, timestamp, _, err = api.SendMessageContext(ctx, channelID, MsgOptionPostEphemeral(userID), MsgOptionCompose(options...))
  	return timestamp, err
  }
docs: // PostEphemeralContext sends an ephemeal message to a user in a channel with a custom context
  // For more details, see PostEphemeral documentation