Ian Campbell e015aff65a alpine: Use docker build --iidfile ...

This was added in 17.06 and allows us to avoid using `$(BASE):build` which is
not safe against parallel builds etc.

Having done this restructure the build to not always delete the built container
and to separate out the `hash` and `version` file rules so that they can be
included in both the `tag` and `push` targets.

Signed-off-by: Ian Campbell <ijc@docker.com>

2017-07-24 12:13:58 +01:00

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