these 2 derivations will be built:
  /nix/store/crczahx6x19mwmbd80qwslsrr8w5zzsr-nixos-test-driver-pgrouting.drv
  /nix/store/8jsmwrnqsgilajpram1vhyc1pyha4p2h-vm-test-run-pgrouting.drv