improve image build performance by sharing layers #158
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new pushes to master look like they can take from 9 minutes to 17 minutes when the images are rebuilt.
this PR should improve build performance by having the release image based on the slim image (e.g. they share layers). Then instead of spending time installing the same dependencies twice (in particular, grpcio and uvloop take a while), we just do it once, so in theory this should halve the build time.