[Request] wkhtmltopdf

It would be very helpful to have an up-to-date image for wkhtmltopdf because BookStack kind of needs it when you use non-Latin text. In BookStack, if you print a book with CJK text, the book will come out all garbled. If you use the current converter, you have to figure out how to print the book with a font that supports CJK text out of the box, which is annoying. It would be nice to add this as a dependency in BookStack’s docker-compose, but the dockerized versions online seem poorly supported.