Tianon Gravi ab8b478648 Improve "slides/Dockerfile" reliability/image size ...

This pins to a specific version of Alpine to insulate against Alpine version bumps renaming packages (or changing the way they work like when `pip` got split out into a separate package) and uses `apk add --no-cache` instead of `apk update` to create a slightly smaller end result.

2019-05-29 15:52:42 -07:00

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