these 2 derivations will be built:
  /nix/store/fjyx8b9qn5ja48rcsp9c8jhnwwgxxbbv-nixos-test-driver-wal2json.drv
  /nix/store/4sf07i9v1fbvp2q2yk23k0k62ciaansk-vm-test-run-wal2json.drv