Fail CI if codecov fails

Author: dstansby

.github/workflows/test_and_deploy.yml

@@ -60,6 +60,7 @@ jobs:
         uses: codecov/codecov-action@v3
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true
 
   deploy:
     # this will run when you have tagged a commit, starting with "v*"