address review

Signed-off-by: szaimen <szaimen@e.mail.de>

Containers/mastercontainer/cron.sh

@@ -2,8 +2,16 @@
 set -eux
 
 while true; do
+    # Check for updates and send notification if yes
     sudo -u www-data php /var/www/docker-aio/php/src/Cron/cron.php
+    # Remove dangling images
     sudo -u www-data docker image prune -f
-    sudo -u www-data docker volume prune -f
+    # Remove dangling volumes
+    unset DANGLING_VOLUMES
+    DANGLING_VOLUMES="$(sudo -u www-data docker volume ls --filter dangling=true | awk '{print $2}' | grep -v "nextcloud_aio_\|^VOLUME$")"
+    mapfile -t DANGLING_VOLUMES <<< "$DANGLING_VOLUMES"
+    for volume in "${DANGLING_VOLUMES[@]}"; do
+        sudo -u www-data docker volume rm "$volume"
+    done
     sleep 1d
 done