Monty Taylor 40fe366727 Remove old artifacts when building new ones
For local dev, multiple iterations can wind up with multiple
files in the build_artifact dir. Remove them when building so
that the ls command works.

Change-Id: Id309c34679d2c0b6d9380665a381af4b52495d19
2020-02-27 13:56:27 -06:00
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