{
  "name":"vets-website",
  "scripts":{},
  "env":{
    "INSTALL_HOOKS": "no",
    "YARN_PRODUCTION":{
      "required": true
    }
  },
  "addons":[],
  "buildpacks": [
    {
      "url": "https://github.com/heroku/heroku-buildpack-nodejs"
    }
  ]
}

{
  "name":"vets-website",
  "scripts":{
    "postinstall": "npm rebuild node-sass"
  },
  "env":{
    "INSTALL_HOOKS": "no",
    "YARN_PRODUCTION":{
      "required": true
    }
  },
  "addons":[],
  "buildpacks": [
    {
      "url": "https://github.com/heroku/heroku-buildpack-nodejs"
    }
  ]
}

Add postinstall script for Heroku
Add postinstall script for Heroku

This change should address the ENOENT errors we are seeing on Heroku