I maintain my own repository for the mysql, mysql55 and mysql56 packages, built in clean chroot and signed with official Arch Linux key (therefore no need to import an extraneous key or keyring)
[muflone-mysql]
SigLevel = Required
Server = https://www.muflone.com/repositories/archlinux/$repo/$arch
Pinned Comments
Muflone commented on 2023-08-16 17:21 (UTC) (edited on 2023-08-16 20:41 (UTC) by Muflone)
Warning
https://dev.mysql.com/doc/refman/8.1/en/downgrading.html
Downgrade from MySQL 8.1 to MySQL 8.0 or earlier is not supported. The only supported alternative is to restore a backup taken before upgrading. It is therefore imperative that you back up your data before starting the upgrade process.
MySQL 8.0 is available in https://aur.archlinux.org/packages/mysql80