A pihole5 compatible cronjob to fetch Adlist(s) from URL and import them to the new gravity.db
chmod +x /etc/cron.daily/update-adlist-list
If you dont like to have a daily cronmail, you can place the script somewhere else and:
echo "bash /path/to/the/script > /dev/null" > /etc/cron.daily/update-adlist-list-silent
chmod +x /etc/cron.daily/update-adlist-list-silent
echo "bash /path/to/the/script > /dev/null 2>&1" > /etc/cron.daily/update-adlist-list-silent
chmod +x /etc/cron.daily/update-adlist-list-silent