I've mostly sent this kind of announcements on buildsys-fedora, while I believe this
mailing list would be far more suited.
docker-rpm-builder, basically, is a way to run plain old rpmbuild within the target
distribution of choice, without the need of setting up virtual machines or managing state
and leftover things. It should work on any host distro that supports docker, and on OSX
with kitematic/docker-machine/boot2docker . It's being usually in real-world scenarios
for building packages since at least one year, mostly for RHEL 5-6-7, with good results,
and it's pretty stable nowadays; I wouldn't know what to add feature-wise, and I
haven't received bug reports for a while (although this statement probably calls for
problems :-) ).