Docker images building fail silently

For example the following job fails silently https://gitlab.com/gitlab-org/gitlab-runner/-/jobs/3454363525.

These jobs should fail for real, however this is blocked by #29490 since we had to separate s390x building properly. This is the offending line https://gitlab.com/gitlab-org/gitlab-runner/-/blob/main/ci/release_docker_images#L254