Try autocreating release notes.

See https://docs.github.com/en/repositories/releasing-projects-on-github/automatically-generated-release-notes

and

https://github.blog/2021-10-04-beta-github-releases-improving-release-experience/

Author: Julian

.github/workflows/packaging.yml

@@ -7,29 +7,35 @@ on:
 
 jobs:
   build:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [macos-latest, ubuntu-latest]
-        python-version: [pypy-3.7, 3.9]
+    runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
-        python-version: ${{ matrix.python-version }}
+        python-version: 3.9
     - name: Install dependencies
       run: python -m pip install build
     - name: Create packages
       run: python -m build .
     - uses: actions/upload-artifact@v2
       with:
-        name: dist-${{ matrix.os }}-${{ matrix.python-version }}
+        name: dist
         path: dist
     - name: Publish package
-      if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags') && matrix.python-version == 'pypy3' && runner.os == 'Linux'
+      if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags')
       uses: pypa/gh-action-pypi-publish@master
       with:
         user: __token__
         password: ${{ secrets.pypi_password }}
+    - name: Create Release Notes
+      if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags')
+      uses: actions/github-script@v4.0.2
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        script: |
+          await github.request(`POST /repos/${{ github.repository }}/releases`, {
+            tag_name: "${{ github.ref }}",
+            generate_release_notes: true
+          });