issue #4: install coverage package

.github/workflows/workflow-lint-test-python.yml

@@ -17,7 +17,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install ruff==0.1.0
+        pip install ruff==0.1.0 coverage
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with ruff
       run: |