Previously, seba_on_arm install/test jobs used to always return a zero
exit code, marking the job successful even when it failed.
Add `set -e` so the job is marked as failed when errors occur.
Change-Id: Id67ac0695255e475f1e6147266ac7051d3567913 Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>