Update build command (#177)

Author: NicolasHug

.github/workflows/wheel.yaml

@@ -47,12 +47,11 @@ jobs:
       test-infra-ref: main
       build-matrix: ${{ needs.generate-matrix.outputs.matrix }}
       post-script: packaging/post_build_script.sh
-      env-var-script: packaging/env_var_script.sh
       smoke-test-script: packaging/fake_smoke_test.py
       package-name: torchcodec
       trigger-event: ${{ github.event_name }}
       build-platform: "python-build-package"
-      wheel-build-extra-args: "-vvv --no-isolation"
+      build-command: "BUILD_AGAINST_ALL_FFMPEG_FROM_S3=1 python -m build --wheel -vvv --no-isolation"
 
   install-and-test:
     runs-on: ubuntu-latest