Configurations for auto-deploy the Heroku Review Apps (includes `app.json` file)

app.json

# app.json

{
  "name": "review-test-guru-app",
  "description": "The application for creating and passing tests with ability to save questions to GitHub Gist.",
  "repository": "https://github.com/georgiybykov/test-guru",
  "scripts": {
    "postdeploy": "pg_dump -Fc $DATABASE_URL | pg_restore --clean --no-owner -n public -d $DATABASE_URL && bundle exec rails db:migrate"
  },
  "env": {
    "LANG": {
      "required": true
    },
    "RACK_ENV": {
      "required": true
    },
    "DATABASE_URL": {
      "required": true
    }
  },
  "addons": [
    "heroku-postgresql:hobby-dev"
  ],
  "buildpacks": [
    {
      "url": "heroku/ruby"
    }
  ]
}

Also you should create Procfile in the root directory of the application with the information about the server configurations inside:

web: bundle exec puma -t 5:5 -p ${PORT:-5000} -e $RAILS_ENV