Resolves `MyHostname()` to an Ip4 address. Caches first successful result, making it cheap to call it over and over. It will also crash whole process if resolving the IP fails!
// Just make sure nothing crashes when calling the IP singletons. _ = MyHostname() _ = MyIp4() // It is ok to not have Ip6 address, but for now we should make sure we always have Ip4 // addresses, since a lot of the code will not work otherwise. That is why we are not