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This commit reduce the final image size from 964MB to 272MB through:
before:

after:

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