Update build action to "test" building on all python versions, then u…

…pload to pyPI if successful

.github/workflows/publish-to-pypi.yml

@@ -1,4 +1,4 @@
-name: "Publish to PyPI"
+name: "Build distributions and publish to PyPI"
 
 on:
   push:
@@ -11,32 +11,50 @@ on:
     - cron: '30 22 15 * *'
 
 jobs:
-  build-and-publish:
-    name: Build and publish Python distributions to PyPI
+  build:
+    name: Build Python distributions
     runs-on: ubuntu-latest
+    strategy:
+      # Matrix to exercise the build backend on all versions of python supported
+      matrix:
+        python: ['3.8', '3.9', '3.10', '3.11', '3.12']
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
-      - name: Set up Python 3.9
-        uses: actions/setup-python@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: ${{ matrix.python }}
 
       - name: Install pypa/build
         run: |
           pip install build
+          python --version
           pip list
 
       - name: Build a binary wheel and a source tarball
         run: python -m build
 
+      - uses: actions/upload-artifact@v4
+        with:
+          name: distributions-built-with-py${{ matrix.python }}
+          path: dist/
+
+  publish:
+    name: "Publish to PyPI"
+    # Only upload for an actual tag
+    if: ${{ startsWith(github.ref, 'refs/tags') }}
+    runs-on: ubuntu-latest
+    needs:
+      - build
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          # Download distributions from one job of the matrix
+          name: "distributions-built-with-py-3.12"
+          path: "dist"
+
       - name: Publish distribution to PyPI
-        if: startsWith(github.ref, 'refs/tags')
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
           password: ${{ secrets.PYPI_API_TOKEN }}
-
-      - uses: actions/upload-artifact@v3
-        with:
-          name: pypi-packages
-          path: dist/