hps-firmware-images: Update signing script to include manifest

Update the firmware signing script to also pull the firmware manifest
from the cloud storage bucket so that the hps-firmware-images ebuild can
install it.

We also add a manually created initial manifest file for the latest
firmware.

BUG=b:231393337
TEST=manual

Change-Id: I2299a0949606b007ef1b142a9f67d10196f934d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/hps-firmware-images/+/3641217
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Tested-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Dan Callaghan <dcallagh@chromium.org>
Reviewed-by: David Lattimore <dml@chromium.org>
2 files changed
tree: 5f339b0c671d6a5a258afc4f7a63edc2623516fe
  1. firmware-signed/
  2. licenses/
  3. script/
  4. OWNERS
  5. PRESUBMIT.cfg