app.json file to enable heroku review apps for ember-cli projects

app.json

{
  "name": "website-name",
  "description": "Your website description.",
  "scripts": {},
  "env": {
    "EMBER_ENV": {
      "value": "production"
    },
    "REBUILD_ALL": {
      "value": "true"
    }
  },
  "addons": [],
  "buildpacks": [{
    "url": "https://github.com/tonycoco/heroku-buildpack-ember-cli"
  }]
}