these 2 derivations will be built:
  /nix/store/n1hij350yzywna37c4113il5cmrzpaz8-nixos-test-driver-wal2json.drv
  /nix/store/qqh2a2bw3xz408c1mkmdckpqvqk6bk43-vm-test-run-wal2json.drv