could you add only a single job for the different varnish version instead of testing both Varnish version on 4 different PHP versions ? Given that a github organization can only have 5 concurrent jobs accross all its repo, it would be better if a build of the bundle uses 5 jobs only rather than 8.

Btw, the fact that you use the FOS repo for your feature branches means that each push triggers 2 builds. See https://github.com/sensiolabs/connect/pull/40#issuecomment-42954795 for more details