Generate json coverage

Author: fre171csiro

.github/workflows/main.yml

@@ -49,7 +49,7 @@ jobs:
         env:
           PYTEST_PLUGINS: pytest_github_actions_annotate_failures
         run: |
-          poetry run pytest --cov=hydroforecastingdemo --cov-report=xml --cov-report=term
+          poetry run pytest --cov=hydroforecastingdemo --cov-report=json:coverage.json --cov-report=term
 
       - name: Update Coverage Badge
         if: github.ref == format('refs/heads/{0}', github.event.repository.default_branch)