Add libpoppler-cpp-dev?

[kevinsoo]

In a container script using this docker image, I run

sudo apt-get update
sudo apt-get install -y libpoppler-cpp-dev

which is needed to use the pdftools library in the R script the container points to. It'd be great to be able to add this installation to the docker image if possible. We're hoping to build out a PDF scraping tool for our OPM engagement at some point.