I put a wiki page up : http://wiki.apache.org/harmony/Automated_Testing
(reachable from the front page) to capture how we track and govern the "community CI" effort that build-test is intended to be.
So I didn't set out any rules other than someone who's interested has to approach the community (we do gatekeep as we need to manually let mail through to -commits) and note that we reserve the right to refuse anyone.
Right now, there's a table that lists the CI going on at IBM. Once Vladimir's machine is sending mail through, we'll add that, and we'll add the build-test running on my x86_64/Ubuntu6 when that's working.
geir