Add step to temporarily roll ceci back to pre-v2

.github/workflows/smoke-test.yml

@@ -32,6 +32,9 @@ jobs:
         pip install .
         pip install .[dev]
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: (Temporarily) roll back ceci to pre-v2
+      run: |
+        pip install ceci==1.17
     - name: Run unit tests with pytest
       run: |
         python -m pytest tests