these 2 derivations will be built:
  /nix/store/l8k3mvhqyiqd3fsgvmnp1vgy23944vl1-nixos-test-driver-wal2json.drv
  /nix/store/vqzvkwyxsc58hg47fgm2jv1xhp6p3hw7-vm-test-run-wal2json.drv