Adapting your github matrix strategy for screenplay writing

I found your explanation for using a matrix on a github action to scan directories and I was trying to adapt it for this purpose:

Versioning Scripts using Fountain and GitHub

As you can see, he stops just short of your fix and suggests adding each new file manually.

I have been trying to apply your solve but I keep missing something and generating errors. I would truly appreciate your help, if you have the time.

Admittedly, this is quite a bit simpler than your issue. I just need the names of the files ending in .fountain, strip the .fountain from the name, put the names into the matrix, then adapt the run line so ${{ matrix }}.fountain and ${{ matrix }}.pdf point to the right things.

Start with the linked Versioning Scripts using Fountain and GitHub article, then inspect the repository's existing GitHub Actions workflow for its matrix and run steps. The requested result is a matrix built from .fountain filenames with the extension removed, and commands that resolve the corresponding .fountain and .pdf paths.