these 2 derivations will be built:
  /nix/store/1a5cp0lkl35ckblm26l9nzx1fk61wlz3-nixos-test-driver-wal2json.drv
  /nix/store/ay3s1djvjbk5zvz1vs2vjgjhcqppn440-vm-test-run-wal2json.drv