Check of signature files

With swupd I’m getting these errors.

swupd[1137799]: Warning: Signature for latest file (http://localhost:7777/version/format30/latest) is missing
swupd[1137799]: Warning: Support for unsigned latest file will be deprecated soon

This is also mentioned here “To mix maintainers: swupd is now enforcing signature of latest file” To mix maintainers: swupd is now enforcing signature of latest file .

How do I fix this on my local mix server, and are there any guides on how to do it ?

@btsvinningen - Can you share the steps you used so I can reproduce this?

Thanks!