OF-2873 Improve debian package

[stokito]

I added a link to the Transifex to make it easier to find. It would be great to add it also on the website.

In the README I also spitted long lines to separate lines to make it easier to read without any work wrapping.

The debian lintian reports a lot of warnings for the deb package itself and I tried to fix some of them.

The biggest change is in the last commit d530fe9
The linitan reported: W: openfire: recursive-privilege-change "chmod -R" [postinst:39]:

mkdir -p /var/log/openfire
mkdir -p /var/lib/openfire/embedded-db
chown -R openfire:openfire /usr/share/openfire
chown -R openfire:openfire /var/lib/openfire
chown -R openfire:openfire /var/log/openfire
chown -R openfire:openfire /etc/openfire
chmod -R o-rwx /usr/share/openfire
chmod -R o-rwx /var/lib/openfire
chmod -R o-rwx /var/log/openfire
chmod -R o-rwx /etc/openfire

Here we have a few problems:

1. The dirs can be created by the openfire.dirs or even better by the make install and then deb package will contain them too.
2. The /usr/share/openfire should contain things like images and assets so it should be read only for anyone and there should be no any need to chown it to the openfire. I removed the chown.
3. The /var/log/openfire actually may be removed and logs by default should be printed to stdout or syslog where they can be collected by the systemd-journald and then available from the journalctl -u openfire -f command. This is not our business how to persist logs. The Prosody allows both: syslog and the append to a log file. This needs to be discussed separately.
4. The /etc/openfire folder is also shouldn't be writable but I see that it may be used for some backup (?). Maybe it would be better to save backups to the /var/lib/openfire folder instead.

[guusdk]

On a cursory look, I can't spot major issues with this, but I'm not familiar with Debian packaging at all.

[akrherz]

@stokito Thanks, I added you in Jira to a group that should allow issue creation there against Openfire.

[github-actions]

Successfully created backport PR for 4.9:

• [Backport 4.9] OF-2873 Improve debian package #2524