Set default directory as "."
Set default directory as "."

Otherwise since it is not a required parameter, we fail part way
through the bulid process:

Cannot resolve caller dir(IO::Path: ); none of these signatures match:
    (IO::Path:D $: Mu :$test = { ... }, :$absolute, :$Str, :$CWD = { ... }, *%_)
  in block <unit> at

gfldex/pod-to-bigpage,gfldex/pod-to-bigpage