ci: Add distribution verification checks to nightly wheel upload (net…

…workx#6831)

* Use 'twine check' to verify distribution and list the contents of the
  dist and wheel for visual inspection of distribution content in the logs.

.github/workflows/nightly.yml

@@ -14,10 +14,20 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: "3.10"
-      - run: |
+      - name: Install Python requirements
+        run: |
           python -m pip install -r requirements/release.txt
-          python -m build --sdist --wheel
-      - uses: scientific-python/upload-nightly-action@main
+      - name: Build a wheel and a sdist
+        run: |
+          python -m build .
+      - name: Verify the distribution
+        run: twine check --strict dist/*
+      - name: List contents of sdist
+        run: python -m tarfile --list dist/networkx-*.tar.gz
+      - name: List contents of wheel
+        run: python -m zipfile --list dist/networkx-*.whl
+      - name: Upload nighlty wheel
+        uses: scientific-python/upload-nightly-action@main
         with:
           anaconda_nightly_upload_token: ${{ secrets.ANACONDA_NIGHTLY }}
           artifacts_path: dist/