ok… i found it!
the PR seems to be ok?
https://nixpk.gs/pr-tracker.html?pr=142261
looks like it’s just been built.
https://hydra.nixos.org/build/159887280
you can find this good stuff out with hydra-check
I’m still trying to find out a good definition of a ‘channel’ vs a commit onto master/unstable , so there might be ‘somewhere else’ to check for ‘builds on a channel’.
hydra-check seems to report quite old builds… but that might be a configuration problem at my end.