run_oci.sh takes its engine from CONTAINER_ENGINE and defaults to docker, so on
the rootless-podman host this script was written for it would have looked for a
docker socket that is not there -- failing on every hourly tick with nothing to
show but a non-zero exit. Found while installing it on the Digesta production
server, before it ran.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>