Heroku container deployment

app.json

{
  "name": "app",
  "env": {
    "RACK_ENV": "staging",
    "RAILS_ENV": "staging",
    "ROLLBAR_ENV": "staging",
    "REDIS_PROVIDER": "REDISTOGO_URL",
    "RAILS_LOG_TO_STDOUT": "true",
    "RAILS_SERVE_STATIC_FILES": "true",
    "SECRET_KEY_BASE": {
      "generator": "secret"
    }
  },
  "formation": { },
  "addons": [
    "cloudinary",
    "librato",
    "logentries",
    "mailtrap",
    "memcachedcloud",
    "heroku-postgresql",
    "rediscloud",
    "redistogo"
  ],
  "stack": "container"
}

heroku.yml

build:
  docker:
    web: Dockerfile
release:
  image: web
  command:
    - rake db:migrate