A simple Docker image that can can be used to merge PDF files.
The following command will take all of the PDF files in the current working directory and merge them into a single file named
output.pdf. The PDFs will be merged in alpha-numeric order (i.e. 2.pdf will come after 1.pdf in the merged output).
docker run --rm -v $(pwd):/work/files -u `id -u $USER` bogosj/merge-pdfs