Simplify GHA step

Author: tcompa

.github/workflows/ci_poetry.yml

@@ -87,22 +87,17 @@ jobs:
       - name: Install dependencies (including fractal-tasks extra)
         run: poetry install --with dev --without docs --no-interaction -E fractal-tasks
 
-      # Check manifest has not changed - START
-      - name: Regenerate the manifest
-        run: poetry run python fractal_tasks_core/dev/create_manifest.py
-      - name: Setup friendly diff style
-        run: echo "*.json diff=json" >> .gitattributes && git config diff.json.textconv "jq --sort-keys '.' \$1"
-      - name: Run git diff for manifest
-        run: git diff ./fractal_tasks_core/__FRACTAL_MANIFEST__.json
       - 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
-      # Check manifest has not changed - END
 
       - name: Cache Pooch folder
         id: cache-pooch-folder