Hi!

With bug https://bugs.gnu.org/43106 just closed we now have a nice way
to inject secrets into the Childhurds.

Using the attached patch, which needs a fresh pull and reconfigure on
berlin (at least the nodes 101,102 that run Childhurds), we can create a
tree of childhurd secrets like so

--8<---------------cut here---------------start------------->8---
/etc/childhurd/etc/guix/signing-key.pub
/etc/childhurd/etc/guix/signing-key.sec
/etc/childhurd/etc/ssh/ssh_host_ed25519_key
/etc/childhurd/etc/ssh/ssh_host_ecdsa_key
/etc/childhurd/etc/ssh/ssh_host_ed25519_key.pub
/etc/childhurd/etc/ssh/ssh_host_ecdsa_key.pub
--8<---------------cut here---------------end--------------->8---

...and then we should be able to start offloading builds for the Hurd.
(I guess we then also need to add a cuirass jobs for the Hurd?)

Janneke