[WIP] Add Build-on-M1 workflow

Author: malfet

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

@@ -0,0 +1,25 @@
+name: Build on M1
+on:
+  pull_request
+jobs:
+  build_vision:
+    runs-on: macos-m1
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+      - name: Build TorchVision M1 wheel
+        shell: arch -arch arm64 zsh {0}
+        run: |
+          source ~/miniconda3/etc/profile.d/conda.sh
+          set -ex
+          conda create -yp conda-env python=3.8 numpy libpng openjpeg wheel pkg-config
+          conda activate -p conda-env
+          python3 -mpip install torch --extra-index-url=https://download.pytorch.org/whl/nightly torch
+          python3 -mpip install delocate
+          python3 setup.py bdist_wheel
+      - name: Upload TorchVision wheel
+        uses: seemethere/upload-artifact-s3@v4
+        with:
+          name: torchvision-py3.8-macos11-m1
+          path: dist/
+