Simple wrapper to run ghost as npm module. To run it inside the GAE flexible environment. And an example package.json for ghost as npm package

index.js

'use strict';
const ghost = require('ghost');
const port = process.env.PORT || 8080;

ghost().then(function (ghostServer) {
    ghostServer.rootApp.listen(port);
});

package.json

{
  "name": "ghostappengine",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "engines": {
    "node": "6.x"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "NODE_ENV=production node index.js"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.16.3",
    "ghost": "^2.9.1",
    "ghost-google-cloud-storage-new": "^1.1.2",
    "knex-migrator": "^3.2.4",
    "mysql": "^2.15.0",
    "prompt": "^1.0.0"
  }
}