util/docker: Fix file ownership when building with coreboot-sdk

Instead of requiring the user to enter their root password to set the
created files to their user, create a new user inside the docker
container with the correct UID & GID and build with that.

Change-Id: Ibbeff00211e8cf653f48204d285e06bca39b5fd2
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/26594
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed