Allow custom path for temporary PDF files #56
Description
Hi,
I'm wondering if it would make sense to allow customization of the path used to store temporary PDF files in the addString method.
Currently, the method uses something like: storage_path('tmp/' . Str::random(16) . '.pdf')
This hardcoded path can be limiting in some environments. Rather than adding a parameter directly to addString, it might make sense to allow the temporary path to be set via the constructor or during initialization of the PDFMerger instance — for example, through a setter method or a configuration option.
What do you think?