github action: build/upload as two steps

.github/workflows/wheels.yml

@@ -5,8 +5,8 @@ on:
   workflow_dispatch:
 
 jobs:
-  pypi:
-    name: PyPI
+  build-wheels:
+    name: Build wheels for PyPI
     strategy:
       matrix:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
@@ -18,19 +18,19 @@ jobs:
       - uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
-        
+
         # install pip prerequisites
       - name: Install cffi and virtualenv
         run: pip install cffi virtualenv
-        
+
         # install rust toolchoin
       - uses: actions-rs/toolchain@v1
         id: rustup
         with:
           profile: minimal
           toolchain: stable
           override: true
-        
+
         # setup macOS as in the maturin tests, see:
         # https://github.com/PyO3/maturin/blob/main/.github/workflows/test.yml
       - name: Install aarch64-apple-darwin Rust target
@@ -45,20 +45,41 @@ jobs:
           echo "CC=${bindir}/clang" >> "${GITHUB_ENV}"
           echo "CXX=${bindir}/clang++" >> "${GITHUB_ENV}"
           echo "SDKROOT=$(xcrun --sdk macosx --show-sdk-path)" >> "${GITHUB_ENV}"
-        
+
         # setup linux
       - name: Install musl tools
         if: matrix.os == 'ubuntu-latest'
         run: sudo apt-get install -y musl-tools
-        
+
         # build and publish
       - name: Install Python dependencies
         run: pip install maturin
       - name: Build wheels
         run: maturin build --release --strip
+      - uses: actions/upload-artifact@v3
+        with:
+          name: wheels
+          path: target/wheels/
+          if-no-files-found: error
+
+  upload-wheels:
+    name: Upload wheels to PyPI
+    needs: build-wheels
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v1
+      - uses: actions/download-artifact@v3
+        with:
+          name: wheels
+          path: wheels/
+      - name: list contents
+        run: ls -R
+        working-directory: wheels/
       - name: publish
         uses: pypa/gh-action-pypi-publish@master
         with:
           user: __token__
           password: ${{ secrets.PYPI_TOKEN }}
-          packages_dir: target/wheels/
+          packages_dir: wheels/
+