Suggest another way of importing GNU Guix GPG key

[dftxbs3e]

Hello,

SKS keyservers are currently under attack 
(https://gist.github.com/rjhansen/67ab921ffb4084c865b3618d6955275f) - 
the attack can cause a GPG client to freeze completely and mess the GPG 
installation completely.

I suggest GNU Guix proposes another way of importing the GPG keys so 
that users will not suffer from this problem.

There's another, newer, keyserver, proposed in this gist, that is run by 
new software that doesnt suffer from this attack. See: 
https://keys.openpgp.org/about/news#2019-06-12-launch

However, that keyserver is not replicated. You could either use that one 
or simply offer a download of the key over TLS with verification against 
installed CAs, as secure as this can get.

Regards