these 2 derivations will be built:
  /nix/store/47adyf5dca4xsrd1npqqrv6f6s1s1n0l-nixos-test-driver-pg_net.drv
  /nix/store/b4a9dq01nq72anga67w3i3bajv6iramx-vm-test-run-pg_net.drv