Brian Goff 5e4444823c build: only use env for args if set ...

When following this pattern:

  buildx build --arg FOO

Where we want to pull `FOO` from env, currently we always set `FOO`
regardless if the `FOO` env var is even set.

This change makes it so that `FOO` would only be set if it has been set
in the env (even if it is set to empty).

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

2020-01-06 12:02:06 -08:00

9.8 KiB

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