I had a few different issues getting the CI broker working the way I wanted to (don't even remember what the issues were, but it had to do with catching patches) so wired up my own way but simply polling via Git - using a thing I built a while back called goa (gitops agent) for another project.

The tricky part was getting the output from what ever do with the code, back into the Radicle patch. But it works.

https://revolveteam.com/blog/goa-radicle-ci/

There are some caveats - mostly security related - given this is potentially executing commands on a host node.