these 2 derivations will be built:
  /nix/store/vj50cxk3x2nrdfi7dvbxps6ka0v3s99f-nixos-test-driver-pg_net.drv
  /nix/store/gf0xjdj8yk411lqjqiv5ihprhgdshcb5-vm-test-run-pg_net.drv