Add rootfs-image-coco-extension to the build-asset-rootfs matrix in the
amd64, arm64 and s390x static tarball workflows so the CoCo extension image
is built as part of CI. Keep building rootfs-image-confidential as well:
the runtime defaults to base + extension, but we retain the monolithic
confidential image for now during the transition.
Signed-off-by: Fabiano Fidêncio <ffidencio@nvidia.com>
Assisted-by: Cursor <cursoragent@cursor.com>