deb cleanup

[davidcoutadeur]

The idea is to do the same thing as what have been done in self-service-password:

• deb cleanup self-service-password#852
• https://github.com/ltb-project/self-service-password/pull/858/files

[davidcoutadeur]

Here is the list of breaking change in the #161 PR, which must be brought to .deb package, and notified in the changelog / in the release notes / documentation:

• the dependencies are now explicitly listed in the package description, including the bundled ones.
• the configuration files are now in /etc/service-desk directory
• the previous configuration files present in /usr/share/service-desk/conf (all .php files) are migrated to /etc/service-desk/ during the upgrade process. config.inc.php is migrated as a config.inc.php.bak file, all other php file names are preserved.
• smarty is now a required package. See consideration about smarty 3 / smarty 4 in Update to smarty4 #158
• some bundled dependencies have been updated:

        "components/jquery": "v3.7.1",
        "datatables.net/datatables.net-bs5": "2.0.8",
        "datatables.net/datatables.net-buttons-bs5": "3.0.2",
        "fortawesome/font-awesome": "v6.5.2",
        "ltb-project/ltb-common": "0.3.0",
        "twbs/bootstrap": "v5.3.2"

• a minimum version of PHP is now required by the package: >=7.3
• dependencies have been removed: php (php module for apache), apache2 (indirect dependency)
• new basic dependencies are now required by the package: php-fpm, smarty4 | smarty3
• hidden files (.gitignore,...) from bundled dependencies are now removed from the package
• now, the cache is being cleaned-up during self-service-password upgrade / install
• use relative path in unit tests
• configuration of smarty4 will be automatically made in config.inc.php if available
• php-fpm configuration for apache will be automatically made if apache is available during installation