ci: fix and reinstate publish-test job for Test PyPI uploads

Author: francois-drielsma

.github/workflows/publish.yml

@@ -59,9 +59,28 @@ jobs:
         name: dist-packages
         path: dist/
 
+  publish-test:
+    needs: build
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
+
+    steps:
+    - name: Download build artifacts
+      uses: actions/download-artifact@v4
+      with:
+        name: dist-packages
+        path: dist/
+
+    - name: Publish to Test PyPI
+      env:
+        TWINE_USERNAME: __token__
+        TWINE_PASSWORD: ${{ secrets.TEST_PYPI_API_TOKEN }}
+      run: |
+        pip install twine
+        twine upload --repository testpypi dist/*
 
   publish-prod:
-    needs: build
+    needs: [build, publish-test]
     runs-on: ubuntu-latest
     if: github.event_name == 'release' && github.event.action == 'published'