Safer publishing mechanism, refs #8

Author: simonw

{{cookiecutter.hyphenated}}/.github/workflows/publish.yml

@@ -27,12 +27,9 @@ jobs:
     - name: Run tests
       run: |
         python -m pytest
-  deploy:
+  build:
     runs-on: ubuntu-latest
     needs: [test]
-    environment: release
-    permissions:
-      id-token: write
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python
@@ -47,6 +44,25 @@ jobs:
     - name: Build
       run: |
         python -m build
-    - name: Publish
+    - name: Store the distribution packages
+      uses: actions/upload-artifact@v4
+      with:
+        name: python-packages
+        path: dist/
+  publish:
+    name: Publish to PyPI
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: [build]
+    environment: release
+    permissions:
+      id-token: write
+    steps:
+    - name: Download distribution packages
+      uses: actions/download-artifact@v4
+      with:
+        name: python-packages
+        path: dist/
+    - name: Publish to PyPI
       uses: pypa/gh-action-pypi-publish@release/v1
 {% endraw %}