This docker was created for the sole purpose of generating PDF files through texliveonfly.
texliveonfly will take care of downloading any other packages needed to compile the .tex file and generate the .pdf. To keep texliveonfly from downloading the packages every time you run this docker, I would suggest building a new Dockerfile for your LaTeX project with this as your base image. Then run tlmgr to install the rest of the packages needed for your project.
To compile:
docker build --pull --rm -f "Dockerfile" -t pdflatex "."
To use the default pdflatex compiler:
docker run --rm -v `pwd`:/source pdflatex [filename].tex
To use XeTeX:
docker run --rm -v `pwd`:/source pdflatex --compiler=xetex [filename].tex