[Nova] Add M1 Conda Builds (#2840)

Summary:
Adding Nova Reusable Workflow for M1 Conda Build. Once this has been running well for a while, we can replace the old `build-m1-binaries.yml` workflow.

Pull Request resolved: https://github.com/pytorch/audio/pull/2840

Reviewed By: DanilBaibak

Differential Revision: D41195298

Pulled By: osalpekar

fbshipit-source-id: 14591b96e998aa43fa57e8e5b0b09d0ce4f4092e

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

+name: Build M1 Conda
+
+on:
+  pull_request:
+  push:
+    branches:
+      - nightly
+  workflow_dispatch:
+
+jobs:
+  generate-matrix:
+    uses: pytorch/test-infra/.github/workflows/generate_binary_build_matrix.yml@main
+    with:
+      package-type: conda
+      os: macos-arm64
+      test-infra-repository: pytorch/test-infra
+      test-infra-ref: main
+  build:
+    needs: generate-matrix
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - repository: pytorch/audio
+            pre-script: packaging/pre_build_script.sh
+            post-script: packaging/post_build_script.sh
+            smoke-test-script: test/smoke_test/smoke_test.py
+            package-name: torchaudio
+    name: ${{ matrix.repository }}
+    uses: pytorch/test-infra/.github/workflows/build_conda_macos.yml@main
+    with:
+      conda-package-directory: packaging/torchaudio
+      repository: ${{ matrix.repository }}
+      ref: ""
+      test-infra-repository: pytorch/test-infra
+      test-infra-ref: main
+      build-matrix: ${{ needs.generate-matrix.outputs.matrix }}
+      pre-script: ${{ matrix.pre-script }}
+      post-script: ${{ matrix.post-script }}
+      smoke-test-script: ${{ matrix.smoke-test-script }}
+      runner-type: macos-m1-12
+      package-name: ${{ matrix.package-name }}
+      # Using "development" as trigger event so these binaries are not uploaded
+      # to official channels yet
+      trigger-event: development
+    secrets:
+      CONDA_PYTORCHBOT_TOKEN: ${{ secrets.CONDA_PYTORCHBOT_TOKEN }}