Test data package MRs with ci-test
Right now if we do /ci-test from a data package MR (without project MRs) we don't have a useful build as every project is disabled: https://lhcb-nightlies.web.cern.ch//nightly/lhcb-master-mr/7803/
It would be nice to do something useful in that case. For example,
- build all projects (easier)
- build projects explicitly given on the "command line"