Using an outdated image can cause problems when `microdnf update` runs, if the distribution doesn't maintain good update hygiene. Although, I suspect that when update failures happen they're really caused by propagation delay of packages to mirrors. Fix by using --pull=always to get a fresh image. Ref https://scylladb.atlassian.net/browse/SCYLLADB-714 Closes scylladb/scylladb#28680