Add brother printer drivers to image

[wigster]

Hi

Could I please ask you to add the brother printer drivers for some legacy printers to the dockerfile:

Tha package is printer-driver-brlaser. It's github page is here:

https://github.com/pdewacht/brlaser

I can add it inside the container easily and everything works, but it's not permanent and I do not know how to modify it in HAOS.

Thanks!