Add github action checking for black formatting.

Author: jtkiley

.github/workflows/test_notebooks.yml

@@ -31,3 +31,9 @@ jobs:
           pytest --nbmake notebooks/*.ipynb
       - name: Enforce clean notebooks
         uses: ResearchSoftwareActions/[email protected]
+      - name: Check black formatting
+        uses: psf/black@stable
+        with:
+          options: "--check --verbose"
+          src: "./notebooks"
+          jupyter: true