Add a check in CI for missing migrations

Author: di

.github/workflows/ci.yml

@@ -35,6 +35,9 @@ jobs:
         run: |
           pip install -U pip setuptools wheel
           pip install -r dev-requirements.txt
+      - name: Check for ungenerated database migrations
+        run: |
+          python manage.py makemigrations --check --dry-run
       - name: Run Tests
         run: |
           python -Wd -m coverage run manage.py test -v2