unbound: prefer ip4 on ubuntu 24 and above

ip6 queries seems to be blocked by spamhaus

setup/start.sh

@@ -22,6 +22,11 @@ readonly MAIL_DATA_DIR="${HOME_DIR}/boxdata/mail"
 readonly script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 readonly ubuntu_version=$(lsb_release -rs)
 
+vergte() {
+    greater_version=$(echo -e "$1\n$2" | sort -rV | head -n1)
+    [[ "$1" == "${greater_version}" ]] && return 0 || return 1
+}
+
 cp -f "${script_dir}/../scripts/cloudron-support" /usr/bin/cloudron-support
 cp -f "${script_dir}/../scripts/cloudron-translation-update" /usr/bin/cloudron-translation-update
 rm -f /usr/bin/cloudron-logs # legacy script
@@ -109,7 +114,11 @@ systemctl restart systemd-journald
 usermod -a -G adm ${USER}
 
 log "Setting up unbound"
-cp -f "${script_dir}/start/unbound.conf" /etc/unbound/unbound.conf.d/cloudron-network.conf
+cp -f "${script_dir}/start/unbound/unbound.conf" /etc/unbound/unbound.conf.d/cloudron-network.conf
+unbound_version=$(unbound -V | sed -n 's/^Version \([0-9.]*\)/\1/p')
+if vergte "${unbound_version}" "1.19.2"; then
+    cp "${script_dir}/start/unbound/prefer-ip4.conf" /etc/unbound/unbound.conf.d/cloudron-prefer-ip4.conf
+fi
 rm -f /etc/unbound/unbound.conf.d/remote-control.conf # on ubuntu 24
 # update the root anchor after a out-of-disk-space situation (see #269)
 # it returns 1 even on fail, it's not clear - https://unbound.docs.nlnetlabs.nl/en/latest/manpages/unbound-anchor.html#exit-code