heroku-ffmpeg-buildpack

Description

Buildpack to add ffmpeg to a heroku-22 app. Modify bin/compile to change version / source. See related repo (https://github.com/MozillaFoundation/heroku-ffmpeg-static-builds) for compiling / uploading safe sources.

Release (and deploy to Mozilla Foundation site)

1. Create a new tag / release
2. Provide a link to the ffmpeg source in the tag / release description
3. Update the buildpack URL on heroku to use the new release URL (i.e. https://github.com/MozillaFoundation/heroku-ffmpeg-buildpack.git#ffmpeg-v6.1.2-31)
4. Update the foundation site (https://github.com/MozillaFoundation/foundation.mozilla.org) /app.json and /.github/workflows/check-ffmpeg-upstream-version.yml to track the latest URL version (i.e. 6.1.2)