these 2 derivations will be built:
  /nix/store/ghhvq3zk109q00r2qpkfbndkadnwa9ik-nixos-test-driver-pgrouting.drv
  /nix/store/26l537086bj6a2ahibbgkblxpw0yrydk-vm-test-run-pgrouting.drv