apply fix to propogate environment to lecture-python-programming.notebooks repo

Author: mmcky

.github/workflows/publish.yml

@@ -53,6 +53,7 @@ jobs:
         run: |
           mkdir -p _build/lecture-python-programming.notebooks
           cp -a _notebook_repo/. _build/lecture-python-programming.notebooks
+          cp environment.yml _build/lecture-python-programming.notebooks
           cp _build/jupyter/*.ipynb _build/lecture-python-programming.notebooks
           ls -a _build/lecture-python-programming.notebooks
       - name: Commit latest notebooks to lecture-python-programming.notebooks