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I have added pdftk binaries that seem to be working for me on the heroku 18 stack. (Closes #8).
The process I used to obtain the binaries was basically adding the ubuntu artful sources to a heroku:heroku-18 docker container, then installing libgcj-common, libgcj17, and pdftk as explained here. This is because for whatever reason those packages are not available on bionic yet. Regardless, the pdftk binary runs on the docker container and is also able to generate filled pdfs in a heroku environment running stack 18, although I have not tested it extensively beyond that.