We currently have a nightly build using ruby 1.9.2 + postgres. We need to support multiple versions of ruby and mysql. Ideally , ree 1.8.7 + mysql. Jenkins supports parameterized build scripts so research is needed.
This is important, currently the generated fixtures in provisioned apps on MySQL are broken (specifically recent /relevance_rails/db changes). We'll need to fix the fixtures for MySQL in order to complete this issue as well.