unclejack f038890332 docs: explain when RUN cache gets invalidated
This adds a few lines to the RUN Dockerfile docs to explain how to
bypass the RUN caching and how ADD can also invalidate the cache for
these instructions.

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Upstream-commit: 239d1ef301eb8d9b2b1e8469489b25ff3708f47f
Component: engine
2014-05-15 12:32:01 +03:00
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