these 2 derivations will be built:
  /nix/store/i34sf4gx82gdfl8sc9x3b57dd837h4v3-nixos-test-driver-pg_net.drv
  /nix/store/ynld2i4fd5ca8s9qzfkkb6vi4500kxaj-vm-test-run-pg_net.drv