IPv6 Support

Here is the CI file:

image: debian:latest

stages:
  - test

ipv6-ping-test:
  stage: test
  script:
    - apt-get update && apt-get install -y inetutils-ping
    - ping6 -c 4 ipv6.google.com

This is the output:

$ ping6 -c 4 ipv6.google.com
PING ipv6.l.google.com (2607:f8b0:400c:c06::66): 56 data bytes
64 bytes from fc00::1: Destination unreachable: No route to destination
64 bytes from fc00::1: Destination unreachable: No route to destination
64 bytes from fc00::1: Destination unreachable: No route to destination
64 bytes from fc00::1: Destination unreachable: No route to destination
--- ipv6.l.google.com ping statistics ---
4 packets transmitted, 0 packets received, 100% packet loss