[Nova] Linux CPU Unittests to Nova (#3323)

Summary:
As discussed in the [Torchaudio Migration Proposal](https://docs.google.com/document/d/1PF8biwiGzsjzfEBM78mlLiRrkcsGsvuYkeqkI66Ym8A/edit), this PR moves the Linux CPU unittest job to Nova tooling. Note that this does not disable the existing CircleCI job at the moment.

Passing Job: https://github.com/pytorch/audio/actions/runs/4986115298/jobs/8926499354?pr=3323

Pull Request resolved: https://github.com/pytorch/audio/pull/3323

Reviewed By: atalman, mthrok

Differential Revision: D46113506

Pulled By: osalpekar

fbshipit-source-id: 1778c360e17b9d02c63bcc60100834c75798d380

.circleci/unittest/linux/scripts/run_test.sh

@@ -17,6 +17,10 @@ declare -a args=(
     '--durations' '20'
 )
 
+if [[ "${CUDA_TESTS_ONLY}" = "1" ]]; then
+  args+=('-k' 'cuda or gpu')
+fi
+
 cd test
 pytest "${args[@]}" torchaudio_unittest
 coverage html

.github/workflows/unittest-linux-cpu.yml

+name: Unit-tests on Linux CPU
+
+on:
+  pull_request:
+  push:
+    branches:
+      - nightly
+      - main
+      - release/*
+  workflow_dispatch:
+
+jobs:
+  tests:
+    strategy:
+      matrix:
+        python_version: ["3.8", "3.9", "3.10"]
+      fail-fast: false
+    uses: pytorch/test-infra/.github/workflows/linux_job.yml@main
+    with:
+      runner: linux.12xlarge
+      repository: pytorch/audio
+      timeout: 120
+      script: |
+        echo '::group::Setup Environment Variables'
+        # Mark Build Directory Safe
+        git config --global --add safe.directory /__w/audio/audio
+
+        # Set up Environment Variables
+        export PYTHON_VERSION="${{ matrix.python_version }}"
+        export USE_FFMPEG="1"
+        export CUDA_TESTS_ONLY="0"
+        unset CUDA_VERSION
+
+        # Set CHANNEL
+        if [[(${GITHUB_EVENT_NAME} = 'pull_request' && (${GITHUB_BASE_REF} = 'release'*)) || (${GITHUB_REF} = 'refs/heads/release'*) ]]; then
+          export UPLOAD_CHANNEL=test
+        else
+          export UPLOAD_CHANNEL=nightly
+        fi
+
+        export PATH="${PWD}/third_party/install/bin/:${PATH}"
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CMD_APPLY_CMVN_SLIDING=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CMD_COMPUTE_FBANK_FEATS=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CMD_COMPUTE_KALDI_PITCH_FEATS=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CMD_COMPUTE_MFCC_FEATS=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CMD_COMPUTE_SPECTROGRAM_FEATS=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_KALDI=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_CUDA=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_HW_ACCEL=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_ON_PYTHON_310=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_AUDIO_OUT_DEVICE=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_MACOS=true
+        echo '::endgroup::'
+
+        set -euxo pipefail
+
+        echo '::group::Setup Conda Environment'
+        ./.circleci/unittest/linux/scripts/setup_env.sh
+        echo '::endgroup::'
+
+        echo '::group::Install PyTorch and Torchaudio'
+        ./.circleci/unittest/linux/scripts/install.sh
+        echo '::endgroup::'
+
+        echo '::group::Run Tests'
+        ./.circleci/unittest/linux/scripts/run_test.sh
+        echo '::endgroup::'