This buildpack has a purpose of filtering out all the files of a given extension from the build repo. Its intention was to be used for a monorepo which has a lot of images, so the png files will be removed and not deployed to the Heroku backend.
To use this buildpack, add it to your build process and define a config var called FILTER_EXTENSION. The
value here is a single extension or a comma-separated list of extensions to be deleted.