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This commit reduce the final image size from 964MB to 272MB through:
before:
![large_image](https://user-images.githubusercontent.com/771411/52812757-67163800-307f-11e9-9f0f-48e3d8c384fe.png)
after:
![reduced_2_image](https://user-images.githubusercontent.com/771411/52812769-6c738280-307f-11e9-9e42-f062c7eff75d.png)
For production, it is also possible to remove some files that it is not
necessary for it (like tests, uncompiled assets, etc) using the
to_remove
argument, for example:--build-arg to_remove="spec node_modules app/assets vendor/assets
lib/assets tmp/cache".
This reduce the final image to 164MB