these 2 derivations will be built:
  /nix/store/sgbaqw484k136yy005y3wv9lm7mh1lqb-nixos-test-driver-wal2json.drv
  /nix/store/5apqpimz0jc9gcj1ljmpfwn73lk679kb-vm-test-run-wal2json.drv