[Nova] Add windows conda workflows (#3288)

Summary:
[Nova] Add windows conda workflows
Same as: https://github.com/pytorch/vision/pull/7547

Pull Request resolved: https://github.com/pytorch/audio/pull/3288

Reviewed By: osalpekar

Differential Revision: D45456203

Pulled By: atalman

fbshipit-source-id: 067fd3b9abaeb9b7b0cd45c05b7c72982dfbfe0f

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

+name: Build Windows Conda
+
+on:
+  pull_request:
+  push:
+    branches:
+      - nightly
+      - main
+      - release/*
+    tags:
+        # NOTE: Binary build pipelines should only get triggered on release candidate builds
+        # Release candidate tags look like: v1.11.0-rc1
+        - v[0-9]+.[0-9]+.[0-9]+-rc[0-9]+
+  workflow_dispatch:
+
+jobs:
+  generate-matrix:
+    uses: pytorch/test-infra/.github/workflows/generate_binary_build_matrix.yml@main
+    with:
+      package-type: conda
+      os: windows
+      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/ffmpeg/build.bat
+            wheel-build-params: "--plat-name win_amd64"
+            post-script: ""
+            package-name: torchaudio
+            conda-package-directory: packaging/torchaudio
+            smoke-test-script: test/smoke_test/smoke_test.py
+    name: ${{ matrix.repository }}
+    uses: pytorch/test-infra/.github/workflows/build_conda_windows.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 }}
+      package-name: ${{ matrix.package-name }}
+      smoke-test-script: ${{ matrix.smoke-test-script }}
+      # 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 }}