ci: Use separate job for TestPyPI

Author: jpmckinney

.github/workflows/pypi.yml

@@ -3,20 +3,40 @@ on: push
 jobs:
   build:
     runs-on: ubuntu-latest
-    permissions:
-      id-token: write
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
           python-version: '3.10'
       - run: pip install --upgrade build
       - run: python -m build --sdist --wheel
-      - name: Publish to TestPyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+      - uses: actions/upload-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+  test:
+    needs: build
+    permissions:
+      id-token: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+      - uses: pypa/gh-action-pypi-publish@release/v1
         with:
           repository-url: https://test.pypi.org/legacy/
           skip-existing: true
-      - name: Publish to PyPI
-        if: startsWith(github.ref, 'refs/tags')
-        uses: pypa/gh-action-pypi-publish@release/v1
+  publish:
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: test
+    permissions:
+      id-token: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+      - uses: pypa/gh-action-pypi-publish@release/v1