Hello,

The Cuirass instance on Berlin is now connected to three more ARM
machines: grunewald, pankow and kreuzberg thanks to Ricardo! We can now
hopefully stop relying on ARM emulated builds.

Here's a patch on maintenance to disable running ARM emulated builds on
hydra-guix build nodes. Those emulated builds are known to fail in
various ways when native builds work properly.

Thanks,

Mathieu