these 2 derivations will be built:
  /nix/store/56bvqjzbb196qjyr59b8h9pi1sn4a6zl-nixos-test-driver-pgrouting.drv
  /nix/store/4r1lhcwrwvjlr55c4haiyqyir7b3hb8v-vm-test-run-pgrouting.drv