these 2 derivations will be built:
  /nix/store/iznsx2dswj65pmqa9z1l1z35dy9qzwy5-nixos-test-driver-pg_net.drv
  /nix/store/xiidw8m0jfnj56ipjraw29jxdj1w2kp6-vm-test-run-pg_net.drv