tate: Exclude /var/lib/mysql files from dar backup
tate: Exclude /var/lib/mysql files from dar backup

Those do not allow to rebuild a db consistently
/var/lib/automysqlbackup allow it so we need to only backup those.

SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site