With our current CI infrastructure, the meta-repositories tests will only run when a pull-request is issued there. This may conceal errors that happen after a dependency was updated (recent exemples with Routing and Doctrine). By keeping track of dependencies of previously successful builds, we can get a list of packages that may have caused the issue, and save time fixing the problem.

To be informed of those, we can trigger nightly builds of supported branches / versions, and run our behat test suites on those. These builds should run on the LTS branch, latest FTR and current master.