[build] Enable ffmpeg tests on ARM

Author: Breakthrough

.github/workflows/build.yml

@@ -36,9 +36,6 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Setup FFmpeg
-        # TODO: This action currently does not work for non-x64 builders (e.g. macos-14):
-        # https://github.com/federicocarboni/setup-ffmpeg/issues/21
-        if: ${{ runner.arch == 'X64' }}
         uses: ./.github/actions/setup-ffmpeg
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}