Docker-compose, postgresql database files are incompatible with server

On OpenSuse LEAP 15.4 I try to install a recent Zammad by docker-compose.

On GitHub - zammad/zammad-docker-compose: Zammad Docker images for docker-compose I currently have
commit ae716aed3d9af86508abe9b9d10ba701ce46e288 (HEAD → master, origin/master, origin/HEAD)
Author: André Bauer monotek@users.noreply.github.com
Date: Wed Nov 23 00:39:57 2022 +0100

I did docker-compose up -d and got this postgres container:
f057b68bdcfd postgres:15.1-alpine "docker-entrypoint.s…" 24 hours ago Restarting (1) 39 seconds ago zammad-docker-compose_zammad-postgresql_1
Why it’s always restarting?
Logs say

2022-11-29 12:18:32.832 UTC [1] FATAL:  database files are incompatible with server
2022-11-29 12:18:32.832 UTC [1] DETAIL:  The data directory was initialized by PostgreSQL version 9.6, which is not compatible with this version 15.1

See postgresql database files are incompatible with server · Issue #315 · zammad/zammad-docker-compose · GitHub
Duplicated post.