gitlab-ci: use images tagged with git ref instead of latest

Since different images can be present at the same time, it is better to
always use the one built for this particular git reference.

Signed-off-by: Oleg Vasilev <oleg.vasilev@intel.com>

V3:
 - Change $CI_COMMIT_REF_NAME to commit-$CI_COMMIT_SHA

Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Signed-off-by: Oleg Vasilev <oleg.vasilev@intel.com>