these 2 derivations will be built:
  /nix/store/11h3xhiqagrbg5679la3f8vqd5ddj0j9-nixos-test-driver-pgrouting.drv
  /nix/store/1k04sar7l1mkh46dng5kaqbvkp33imrl-vm-test-run-pgrouting.drv