feat: add new scripts for debian 12

- tftp_is_disabled              ->      2.1.16
- network_services_listening    ->      2.1.22
- use_time_sync                 ->      2.3.1.1
Update the existing script to check there is only one installed

- chrony_is_enabled_and_running ->      2.3.3.3

bin/hardening/use_time_sync.sh

@@ -6,7 +6,7 @@
 #
 
 #
-# Ensure time synchronization is in use (Not Scored)
+# Ensure a single time synchronization daemon is in use (Automated)
 #
 
 set -e # One error, it's over
@@ -15,28 +15,31 @@ set -u # One variable unset, it's over
 # shellcheck disable=2034
 HARDENING_LEVEL=3
 # shellcheck disable=2034
-DESCRIPTION="Ensure time synchronization is in use"
+DESCRIPTION="Ensure a single time synchronization is in use"
 
 PACKAGES="systemd-timesyncd ntp chrony"
 
 # This function will be called if the script status is on enabled / audit mode
 audit() {
-    FOUND=false
+    local count=0
     for PACKAGE in $PACKAGES; do
         is_pkg_installed "$PACKAGE"
-        if [ "$FNRET" = 0 ]; then
-            ok "Time synchronization is available through $PACKAGE"
-            FOUND=true
+        if [ "$FNRET" -eq 0 ]; then
+            let count=$((count+1))
         fi
     done
-    if [ "$FOUND" = false ]; then
+    if [ "$count" -eq 0 ]; then
         crit "None of the following time sync packages are installed: $PACKAGES"
+    elif [ "$count" -gt 1 ]; then
+        crit "Multiple time sync packages are installed, from $PACKAGES. Pick one and remove the others"
+    else
+        info "A single time sync package from $PACKAGES is installed"
     fi
 }
 
 # This function will be called if the script status is on enabled mode
 apply() {
-    :
+    info "This recommendation has to be reviewed and applied manually"
 }
 
 # This function will check config parameters required