Add Unbound as better DNSSEC enabled resolver

data/Dockerfiles/unbound/docker-entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+unbound-control-setup
+echo "Receiving anchor key..."
+/usr/sbin/unbound-anchor -a /etc/unbound/trusted-key.key
+echo "Receiving root hints..."
+curl -#o /etc/unbound/root.hints https://www.internic.net/domain/named.cache
+
+exec "$@"