[Nova] Build Linux Conda Binaries using reusable workflow (#2626)

Summary:
Calling the reusable workflow introduced in https://github.com/pytorch/test-infra/pull/546 to build conda binaries on linux.

Pull Request resolved: https://github.com/pytorch/audio/pull/2626

Reviewed By: mehtanirav

Differential Revision: D39028057

Pulled By: osalpekar

fbshipit-source-id: d74ea3771967d0ee2b0ad28a8f811a95145b2183

.github/workflows/build_linux_conda.yml

+name: Build TorchAudio Linux Conda Binaries
+
+on:
+  workflow_dispatch:
+
+jobs:
+  run-reusable-build-workflow:
+    uses: pytorch/test-infra/.github/workflows/build_conda_linux_reusable.yml@fix_pre_post
+    with:
+      domain: "torchaudio"
+      image: "pytorch/conda-builder:cpu"

packaging/pkg_helpers.bash

@@ -143,6 +143,8 @@ setup_macos() {
 #
 # Usage: setup_env 0.2.0
 setup_env() {
+  # https://github.com/actions/checkout/issues/760#issuecomment-1097501613
+  git config --global --add safe.directory /__w/audio/audio
   git submodule update --init --recursive
   setup_cuda
   setup_build_version

packaging/post_build_script_conda.sh

+echo "Running post build script..."

packaging/pre_build_script_conda.sh

+#!/bin/bash
+set -ex
+
+echo "Running pre build script..."
+export FFMPEG_ROOT=${PWD}/third_party/ffmpeg
+if [[ ! -d ${FFMPEG_ROOT} ]]; then
+    packaging/ffmpeg/build.sh
+fi
+echo FFMPEG_ROOT=${FFMPEG_ROOT}
+
+echo "Setting environment variables for versions..."
+
+script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+. "$script_dir/pkg_helpers.bash"
+
+export BUILD_TYPE="conda"
+export CU_VERSION="cpu"
+export PYTHON_VERSION="3.8"
+setup_env
+export SOURCE_ROOT_DIR="$PWD"
+setup_conda_pytorch_constraint
+setup_conda_cudatoolkit_constraint
+setup_visual_studio_constraint
+
+export CUDATOOLKIT_CHANNEL="nvidia"
+# NOTE: There are some dependencies that are not available for macOS on Python 3.10 without conda-forge
+# nit
+if [[ ${OSTYPE} =~ darwin* ]] && [[ ${PYTHON_VERSION} = "3.10" ]]; then
+    CONDA_CHANNEL_FLAGS="${CONDA_CHANNEL_FLAGS} -c conda-forge"
+fi