See #3 for previous discussion

Also, docker-library/node#14

I don't agree with that: if you need production dependencies, just add the NODE_ENV=production env variable. In my use case, I build the container into the CI and only the succeed container will go into production, we use the same container to ensure the reliability of the deployed code.

I am closing this since we want the onbuild variant to be as general purpose as possible and there exists ways to force production packages only gets installed.

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