Refactor cleanup steps to use cleanup_lxc function

Replaces repeated manual cleanup commands with a single call to the cleanup_lxc function across all install scripts. This change improves maintainability and consistency by centralizing cleanup logic.

install/glpi-install.sh

@@ -132,6 +132,8 @@ EOF
 $STD a2dissite 000-default.conf
 $STD a2enmod rewrite
 $STD a2ensite glpi.conf
+rm -rf /opt/glpi/install
+rm -rf /opt/glpi-${RELEASE}.tgz
 msg_ok "Setup Service"
 
 msg_info "Setup Cronjob"
@@ -152,11 +154,4 @@ msg_ok "Update PHP Params"
 
 motd_ssh
 customize
-
-msg_info "Cleaning up"
-rm -rf /opt/glpi/install
-rm -rf /opt/glpi-${RELEASE}.tgz
-$STD apt -y autoremove
-$STD apt -y autoclean
-$STD apt -y clean
-msg_ok "Cleaned"
+cleanup_lxc