gulp.config.json

{
  "image_server_name": {
    "ps_url": "",
    "deploy_credentials": {
      "host": "",
      "user": "",
      "pass": "",
      "remotePath": ""
    }
  },

  "image_server_name2": {
    "ps_url": "",
    "deploy_credentials": {
      "host": "sftp_host",
      "user": "user",
      "pass": "password",
      "remotePath": "/path/to/assets/folder"
    }
  },

  "default_deploy_target": "image_server_name"
}