Try macos build

.github/workflows/main.yml

@@ -87,3 +87,35 @@ jobs:
           asset_path: _install/piper_windows_amd64.zip
           asset_name: piper_windows_amd64.zip
           asset_content_type: application/zip
+  build_macos:
+    name: "macos build: ${{ matrix.arch }}"
+    runs-on: macos-latest
+    needs: create_release # we need to know the upload URL
+    strategy:
+      fail-fast: true
+      matrix:
+        arch: [x64, aarch64]
+    steps:
+      - uses: actions/checkout@v3
+      - name: configure
+        run: |
+          cmake -Bbuild -DCMAKE_INSTALL_PREFIX=_install/piper
+      - name: build
+        run: |
+          cmake --build build --config Release
+      - name: install
+        run: |
+          cmake --install build
+      - name: package
+        run: |
+          cd _install && \
+          tar -czf piper_macos_${{ matrix.arch }}.tar.gz piper/
+      - name: upload
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        with:
+          upload_url: ${{ needs.create_release.outputs.upload_url }}
+          asset_path: _install/piper_macos_${{ matrix.arch }}.tar.gz
+          asset_name: piper_macos_${{ matrix.arch }}.tar.gz
+          asset_content_type: application/octet-stream