Historically there weren't any ARM builds over at https://hub.docker.com/_/mysql?tab=tags , which (if I understand correctly) are "official" in a totally different way (these namespace-less images are maintained by Docker Inc?) ... it seems as of the most recent MySQL release (8.0.28) they've started supplying ARM builds with the "-oracle" tag though.
Historically there weren't any ARM builds over at https://hub.docker.com/_/mysql?tab=tags , which (if I understand correctly) are "official" in a totally different way (these namespace-less images are maintained by Docker Inc?) ... it seems as of the most recent MySQL release (8.0.28) they've started supplying ARM builds with the "-oracle" tag though.