these 2 derivations will be built:
  /nix/store/5vs1mk6kp954wr9d7s2s1v7sjhbi8gx5-nixos-test-driver-pg_net.drv
  /nix/store/g4jl9hxgi8f8rjl4qxifp7r2lv7d4i6d-vm-test-run-pg_net.drv