There are other container build tools such as Kaniko that have solved the reproducible builds issue right? If we're operating at scale, it probably means we are

There are other container build tools such as Kaniko that have solved the reproducible builds issue right? If we're operating at scale, it probably means we are using some flavor of Kubernetes and the Docker runtime is no longer relevant. Would Redhat OpenShift's source-to-image (S2I) build process solve the reproducible builds requirement? This space moves quickly and the assumptions we had last week may no longer be relevant. For example Crunchy Postgres offers an enterprise supported Kubernetes Operator that leverages stateful sets. Yet I am reading in these comments that it is an unsolved issue.