dockerfiles:  Make a dockerfile that builds the firmware.

To use this from the top level dolos directory do:

docker build --output "./build_result" \
             --target copytohost \
	     -f dockerfiles/Dockerfile.firmware .

docker build --output "./build_result" \
             --target copytohost \
	     -f dockerfiles/Dockerfile.updater .

BUG=b:321269237
TEST=local build

Change-Id: Ie8a7330eabb4a95d48beeb7a3704281cf86c6b82
Reviewed-on: https://chrome-internal-review.googlesource.com/c/chromeos/third_party/dolos/+/7156546
Tested-by: Keith Haddow <haddowk@google.com>
Auto-Submit: Keith Haddow <haddowk@google.com>
Commit-Queue: Keith Haddow <haddowk@google.com>
Reviewed-by: Samuel Jacob <samjaco@google.com>
4 files changed