Making sure channel flag is set correctly

Use only 1 channel

Author: atalman

.github/workflows/build-m1-binaries.yml

@@ -137,11 +137,11 @@ jobs:
           set -ex
           . packaging/pkg_helpers.bash
 
-          export CONDA_CHANNEL_FLAGS=""
+          export CONDA_CHANNEL=" -c pytorch-nightly"
           if [[ $CHANNEL == "test" ]]; then
             setup_cuda
             setup_base_build_version
-            export CONDA_CHANNEL_FLAGS="pytorch-test"
+            export CONDA_CHANNEL="-c pytorch-test"
             setup_macos
           else
             setup_cuda
@@ -156,7 +156,7 @@ jobs:
           setup_conda_pytorch_constraint
           setup_conda_cudatoolkit_constraint
           setup_visual_studio_constraint
-          conda build -c defaults $CONDA_CHANNEL_FLAGS --no-anaconda-upload --python "$PYTHON_VERSION" packaging/torchaudio
+          conda build -c defaults $CONDA_CHANNEL --no-anaconda-upload --python "$PYTHON_VERSION" packaging/torchaudio
           mkdir -p dist
           cp ~/miniconda3/conda-bld/osx-arm64/*.tar.bz2 dist/
       - name: Upload package to GitHub