these 2 derivations will be built:
  /nix/store/4byc8dpypd9yjvwj9fi2sy0nyca4lmg4-nixos-test-driver-http.drv
  /nix/store/7753b7kqqcxmglxl24cl9qh5p7mj5fyp-vm-test-run-http.drv