guix archive --authorize started issuing a warning some time ago
pointing to "authorized-keys" in "operating-system".
* that is not a valid field of operating-system
* there is no such item in the Guix info page's index
* the relevant example loads a single key from a file, without
indicating what the syntax of the file is
* trying to store /etc/guix/signing-key.pub as a Scheme file results in
a parser error due to the hexadecimal syntax being incompatible with
some Scheme syntax weirdness
So, how the hecc do I add keys permanently the Official Way? Because I
have no idea. I'll try to update the docs when I figure it out.
OOoor... the person who introduced the change could document it. :|