Feature request: Domain support for Wireguard endpoints

[KuramaSyu]

What's the feature 🧐

Currently, as wireguard endpoints, only IPs are supported. But I got a domain as Endpoint from my VPN provider. When resolving the domain to get the IP, I get 3 different ones. And I don't know if the IP will change at some point, hence gluetun would fail. This is why support for Domains, instead of IPs for a wireguard endpoint would be nice.

Extra information and references

Example for what I got from Windscribe:

[Peer]
...
Endpoint = zrh-264-wg.whiskergalaxy.com:443

nslookup:

user@debian ~> nslookup zrh-264-wg.whiskergalaxy.com
Server:         192.168.124.1
Address:        192.168.124.1#53

Non-authoritative answer:
Name:   zrh-264-wg.whiskergalaxy.com
Address: 141.255.162.196
Name:   zrh-264-wg.whiskergalaxy.com
Address: 31.7.62.52
Name:   zrh-264-wg.whiskergalaxy.com
Address: 141.255.162.212

well, which one to use know? Will the IP maybe change at some point? Is it at this point even secure, when depending on an IP?

These were my questions I had. The simplest way would be allowing domain names.

[github-actions]

@qdm12 is more or less the only maintainer of this project and works on it in his free time.
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