Fix workflow

Author: danew

.github/workflows/release.yml

@@ -35,7 +35,7 @@ jobs:
         run: |
           docker buildx build \
             --platform ${{ matrix.platform }} \
-            -f ffmpeg.Dockerfile \
+            -f Dockerfile \
             -t ffmpeg-whip:builder-${{ matrix.archTag }} \
             --load .