Specify docker image

Author: NicolasHug

.github/workflows/build_ffmpeg.yaml

@@ -62,6 +62,7 @@ jobs:
       upload-artifact: ffmpeg-lgpl-linux_aarch64-${{ matrix.ffmpeg-version }}
       repository: meta-pytorch/torchcodec
       runner: linux.arm64.2xlarge
+      docker-image: pytorch/manylinux2_28_aarch64-builder:cpu-aarch64
       script: |
         export FFMPEG_VERSION="${{ matrix.ffmpeg-version }}"
         export FFMPEG_ROOT="${PWD}/ffmpeg"