these 2 derivations will be built:
  /nix/store/4bxp8dxn7nzkb8kp7v0a79r1g4i7bza7-nixos-test-driver-http.drv
  /nix/store/lw8p7qs7h07kfkcd0pzgv27ac4xmz53d-vm-test-run-http.drv