(setup-networking.sh): Add cloudflare resolver

We are observing very strange resolving issues:
kernelci/kernelci-pipeline#1064

This is attempt to improve DNS reliability.

Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>

config/rootfs/debos/scripts/setup-networking.sh

@@ -18,5 +18,6 @@ fi
 ln -sf /lib/systemd/resolv.conf /etc/resolv.conf
 
 # Setup some static DNS defaults (Google Public)
+echo "nameserver 1.1.1.1" >> /etc/resolv.conf
 echo "nameserver 8.8.8.8" >> /etc/resolv.conf
 echo "nameserver 8.8.4.4" >> /etc/resolv.conf