Add IPv6 Support

[senepa]

After installing the pi-hole app I discovered that the IPv6 resolution features were unusable.

As of this post there are thousands of Lightning nodes available on IPv4 space yet less than 200 available via IPv6. (https://1ml.com/statistics)

This patch aims to provide at least outbound IPv6 support for the pihole application by adding the IPv6NAT container (https://github.com/robbertkl/docker-ipv6nat) and assigning unique local addresses to existing containers.

[senepa]

IPv6NAT has been depreciated in favor of native docker IPv6 support (https://github.com/robbertkl/docker-ipv6nat/issues/65)

The following addition in /etc/docker/daemon.json enables IPv6 support { "ipv6": true, "fixed-cidr-v6": "fd00::/80", "experimental": true, "ip6tables": true }

[mayankchhabra]

Thank you for the PR, @senepa! With the launch of umbrelOS 1.0, we've introduced extensive changes to both the source code and the system's architecture. As part of this transition, we're reviewing and closing PRs and issues that might no longer be applicable to the new version. So I'll be closing this PR for now. Thanks again!