Hey,

> I guess the first step would be to provide an a ‘package-channel(s)’
> procedure that does like ‘package-provenance’, but returns a list of
> channels.

Seems fine to me. Here's an implementation attached. If it works for
you, the next step will be to make the "cuirass-jobs" procedure of
"gnu-system.scm" operate on channels I guess.

WDYT?

Thanks,

Mathieu