Setup FFmpeg in GitHub Actions to use ffmpeg and ffprobe.

steps:
  - uses: actions/checkout@v2
  - uses: FedericoCarboni/setup-ffmpeg@v1-beta
    id: setup-ffmpeg
  - run: ffmpeg -i input.avi output.mkv

This action uses FFmpeg builds provided by the following sources:

• linux builds https://johnvansickle.com/ffmpeg/
• windows builds https://www.gyan.dev/ffmpeg/builds/