Unoconv/LibreOffice buildpack for the heroku-18 stack

Add the heroku-buildpack-apt buildpack to your project:

heroku buildpacks:add --index 1 https://github.com/heroku/heroku-buildpack-apt.git

Add this buildpack to your project:

heroku buildpacks:add --index 2 https://github.com/josduj/heroku-buildpack-unoconv.git

Create an Aptfile file in your project root with the following content only:

unoconv

Redeploy your project after committing the above file.