Package installation creates database.yml as root and thus breaks the installation until next update

[MrGeneration]

Infos:

• Used Zammad version: 5.0.2/stable, technically any version of Zammad
• Installation method (source, package, ..): package
• Operating system: any
• Database + version: any
• Elasticsearch version: any
• Browser + version: any
• Originally found by klausneil on the community: https://community.zammad.org/t/solved-problem-installing-zammad-v5/8020
• This is a regression of issue Zammad database credentials are world-readable #3828

Expected behavior:

Zammads installation processes set correct file permissions to ensure everything works.

Actual behavior:

During installation, since issue #3828 and the chmod 600 for the database.yml fresh installations break.
The reason for this is the postinstall.sh script to not run a chown on the file in question.

Here's proof that it's always been this way but wasn't discovered "thanks to" too open permissions:

root@debian-verify:~# cat /opt/zammad/VERSION
4.1.x
root@debian-verify:~# ls -la /opt/zammad/config/database.yml
-rw-r--r-- 1 root root 139 Nov  4 11:12 /opt/zammad/config/database.yml

Technically any update or re-installation over the existing installation would solve the issue as our packages enforce a chown -R zammad.zammad upon every installation.

After upgrade:

root@debian-verify:~# cat /opt/zammad/VERSION
5.0.x
root@debian-verify:~# ls -la /opt/zammad/config/database.yml
-rw------- 1 zammad zammad 139 Nov  4 11:12 /opt/zammad/config/database.yml

Steps to reproduce the behavior:

• Install Zammad 5.0.2 as of 3rd or 4th November before 12pm german time

Yes I'm sure this is a bug and no feature request or a general question.