DoT (port 853) to 1.1.1.1 through ProtonVPN VPN tunnel gets TCP RST,
causing gluetun healthcheck to fail (can't resolve github.com /
cloudflare.com). k8s coredns at 10.43.0.10 is reachable via eth0
within FIREWALL_OUTBOUND_SUBNETS, bypassing the VPN for DNS while
letting all other traffic tunnel correctly.
Also rename VPN_ENDPOINT_IP/PORT to WIREGUARD_ENDPOINT_IP/PORT to
suppress gluetun deprecation warnings.
Will Anderson
a1623eda39