It requests ~1GB of memory which is too much for a test case I think.
Simple changes to reduce memory consumption is setting
CoordBase::dx = 1.5 CoordBase::dy = 1.5 CoordBase::dz = 1.5 CarpetRegrid2::num_levels_1 = 2
CoordBase::dx = 1.0 CoordBase::dy = 1.0 CoordBase::dz = 1.0 CarpetRegrid2::num_levels_1 = 4
which should bring memory consumption down to ~150MB which is much better eg on the Jenkins test slaves.