these 2 derivations will be built:
  /nix/store/5dmshhqy6qg6ib7nfxwiw3h7ffrcfmzy-nixos-test-driver-pgrouting.drv
  /nix/store/5172a4amrfkfm6v7977559gpk5hfpbxa-vm-test-run-pgrouting.drv