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experimental: Support LLB output format

Authored by dduvall on Apr 16 2019, 7:11 PM.

Description

experimental: Support LLB output format

Moby's BuildKit defines a low-level build language called LLB that
expresses image builds as a graph of source-code-to-binary artifacts. It
promises to make image building more efficient among many other things.
(See https://github.com/moby/buildkit)

This is a first step in supporting LLB. It uses the docker2llb package
to convert the dockerfile compiler's output and is therefore
inefficient in its transcompilation. However, the actual resulting LLB
instructions should be reasonably efficient.

Change-Id: I265812482ea91873c4eb26603fc33b3bc28c26de

Details