Add the ability to release a given commit id, and normalize the tarballs
to use coreboot/1000 for owner and group, and the last commit date as
mtime for all files.
Change-Id: Ia349f429090fe9804f7f14c226812646e2f712be
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/13514
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>