ci: install ffmpeg for audio byte regression coverage

Signed-off-by: LauraGPT <18321252+LauraGPT@users.noreply.github.com>

Author: LauraGPT

.github/workflows/test-numpy-compatibility.yml

@@ -66,6 +66,11 @@ jobs:
         with:
           python-version: "3.12"
           cache: pip
+      - name: Install audio decoder
+        run: |
+          sudo apt-get update
+          sudo apt-get install --no-install-recommends -y ffmpeg
+          ffmpeg -version
       - name: Install CPU runtime and requested NumPy version
         run: |
           python -m pip install torch==2.10.0 torchaudio==2.10.0 --index-url https://download.pytorch.org/whl/cpu