util/release: Update build-release script

- Make variables for the release name and the tarballs instead of
writing them out every time.
- Skip some more unnecessary files when creating the tarballs.
- Remove unnecessary check for the commit ID. It's now a required field.
- Correctly get and save the time of the last release for use in
creating the tarballs.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: I56cd5e2dcf01ee55e5d45e837db2f89904b06ddd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73004
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>

0 files changed, 0 insertions, 0 deletions