Simplify publish.yml to be triggered on GH Release creation

.github/workflows/publish.yml

@@ -1,9 +1,8 @@
 name: Publish to PyPI
 
 on:
-  push:
-    branches:
-      - main
+  release:
+    types: [created]
 
 jobs:
   build:
@@ -21,22 +20,21 @@ jobs:
       - name: Build a binary wheel and a source tarball
         run: python3 -m build
       - name: Store the distribution packages
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: python-package-distributions
           path: dist/
 
   publish:
     name: Publish to PyPI
-    if: startsWith(github.ref, 'refs/tags/') # only publish to PyPI on tag pushes
     needs:
       - build
     runs-on: macos-latest
     environment:
       name: release
       url: https://pypi.org/p/jaffle-shop-generator
     permissions:
-      id-token: write # IMPORTANT: mandatory for trusted publishing
+      id-token: write
 
     steps:
       - name: Download all the dists
@@ -46,35 +44,3 @@ jobs:
           path: dist/
       - name: Publish dist to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
-
-  github-release:
-    name: Publish GitHub Release
-    needs:
-      - publish-to-pypi
-    runs-on: macos-latest
-    permissions:
-      contents: write # IMPORTANT: mandatory for making GitHub Releases
-      id-token: write # IMPORTANT: mandatory for sigstore
-
-    steps:
-      - name: Download all the dists
-        uses: actions/download-artifact@v4
-        with:
-          name: python-package-distributions
-          path: dist/
-      - name: Sign the dists with Sigstore
-        uses: sigstore/gh-action-sigstore-python@v2
-        with:
-          inputs: |
-            ./dist/*.tar.gz
-            ./dist/*.whl
-      - name: Create GitHub Release
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
-        run: |
-          gh release create '${{ github.ref_name }}' --repo '${{ github.repository }}' --notes ""
-      - name: Upload artifact signatures to GitHub Release
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
-        run: |
-          gh release upload '${{ github.ref_name }}' dist/** --repo '${{ github.repository }}'