No idea how to report a bug at bugs.almalinux.com, can’t create an account. So here it is:
galera_new_cluster is broken in mariadb-10.11.15-1.el10_1.x86_64. The work around is simple, add this file “/etc/systemd/system/mariadb.service.d/fix_galera_new_cluster.conf”:
[Service]
# Use an environment file to pass variable _WSREP_NEW_CLUSTER
# This should be taken care of by /usr/lib/systemd/system/mariadb.service
# but is lacking in mariadb-10.11.15-1.el10_1.x86_64, it's probably a bug
EnvironmentFile=-/run/mariadb/wsrep-new-cluster
For reference: this part is included in /usr/lib/systemd/system/mariadb.service in mariadb10.11-10.11.15-2.el10.src.rpm on Centos Stream.