Extend TF docker build script to allow passing in a custom docker tag.

This is used for building AL partner dockers with custom tags.

BUG=None
TEST=local build and run

Change-Id: Id2fa9c7ea1b37b8c82682798774075c99cc9e6d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/6007262
Tested-by: Alex Bergman <abergman@google.com>
Auto-Submit: Alex Bergman <abergman@google.com>
Commit-Queue: Alex Bergman <abergman@google.com>
Reviewed-by: Seewai Fu <seewaifu@google.com>
1 file changed