Feature request: Display IPv6 address via internal REST API/control server

[GGegenhuber]

What's the feature 🧐

gluetun currently retrieves its IPv4 address via http request to ipinfo.io API. This address is then returned by the internal v1/publicip/ip REST endpoint.

Several VPN services (e.g., Mullvad) already support IPv6. It would be convenient to also offer the current IPv6 address via the internal REST interface. The ipinfo.io API supports both IPv4 and IPv6, i.e., there is an IPv6 only endpoint that is reachable via https://v6.ipinfo.io/

Extra information and references

No response

[qdm12]

Done in 3449e7a 😉