log of changes needed for debian 11>12 upgrade

[martenson]

@martindemko please fill in what you've found out

xref: #114

[martindemko]

• remove 3 python envs (/srv/galaxy/venv/, /srv/tiaas/venv/, /opt/certbot): they will be recreated correctly with playbook run
• upgrade PostgreSQL 13 (deprecated in deb12) into 15 (latest in deb12) using the command: pg_upgradecluster -v 15 13 main, however, I had to manually copy data from /etc/postgresql/13/main/conf.d/* into /etc/postgresql/15/main/conf.d/* in the process
• activate RBD: install ceph-common (to obtain rbdmap.service) following with mount -a
• TUSd version had to be conserved in playbook (Quick patch after upgrade Debian from 11 to 12 #114) to v2.6.0 as v2.7.0 could not be downloaded due to a broken download link
• install docker (playbook run will do it, it might be necessary to move the docker role into the beginning of the playbook)
• postfix remains broken (however, it should be handled by Puppet)
• handling the Tiaas role during the playbook run was too tricky on GCZ; I turned Tiaas off, and after the first successful run, I turned it back on (no idea about the reason).
• handling of Redis role during playbook was troublesome: I had to uninstall it and remove all configuration files. Also, following the advice of ChatGPT-4, I increased this from 0 sysctl -w user.max_user_namespaces=28633, but after installation, I set it back to 0 because other machines use 0 value. Not sure what have helped at the end.

[martindemko]

TUSd trouble solved here