I'm using the machine-ssh-configuration, I set `(authorize? #t)` which
the manual states should authorize the deploying machine onto the
remote host, but I get an error:
```
guix deploy: error: unauthorized public key: (public-key...
```
So I add to the OS definition:
```
(guix-configuration
(authorized-keys (append `(,(local-file
"/etc/guix/signing-key.pub")) %default-authorized-guix-keys))))
```
Which makes the error go away. I'm under the impression however that
the 'authorize? #t' field should be doing this without me needing to
add it to the OS configuration.
