Update method for checking manifest has not changed

Author: tcompa

.github/workflows/ci_poetry.yml

@@ -90,16 +90,7 @@ jobs:
         run: poetry install --with dev --without docs --no-interaction -E fractal-tasks
 
       - name: Check if manifest has changed
-        run: |
-          poetry run python fractal_tasks_core/dev/create_manifest.py
-          echo "*.json diff=json" >> .gitattributes && git config diff.json.textconv "jq --sort-keys '.' \$1"
-          git diff ./fractal_tasks_core/__FRACTAL_MANIFEST__.json
-          if [ -n "$(git diff --exit-code ./fractal_tasks_core/__FRACTAL_MANIFEST__.json)" ]; then
-          echo "__FRACTAL_MANIFEST__.json has changed. Please run 'poetry run python fractal_tasks_core/dev/create_manifest.py' and commit the changes."
-            exit 1
-          else
-            echo "__FRACTAL_MANIFEST__.json has not changed."
-          fi
+        run: poetry run fractal-manifest check --package fractal-tasks-core
 
       - name: Cache Pooch folder
         id: cache-pooch-folder