Hello.
Dockerized version by default doesn't have access to the application resources via -r /path/to/resource. If you used that option, you'll need to change docker image and copy application resources into it too, shouldn't be very difficult. But usually it should be enough to change feature config on the client side. You can try this:
We haven't heard of libxss1 missing in the docker image. This sounds odd considering nature of the docker. I've opened ticket to investigate this: https://github.com/bryntum/support/issues/1603
Can you tell us more about your env? On which system do you run docker? How do you run this image? Do you have any changes to original image beside this libxss1 installation?
Ok thanks.
Just noticed that the pdfexporter uses a Debian image. It would be valuable to use an Alpine one, as it is yields a way lighter final image, and is also more secure