ref: dockerize
./app
| d--------- | api/ |
| d--------- | assets/ |
| d--------- | concerns/ |
| d--------- | controllers/ |
| d--------- | helpers/ |
| d--------- | jobs/ |
| d--------- | mailers/ |
| d--------- | models/ |
| d--------- | presenters/ |
| d--------- | serializers/ |
| d--------- | services/ |
| d--------- | sweepers/ |
| d--------- | views/ |