fix: add coverage package to test dependencies in GitHub Actions workflow

Author: FabrizioMusacchio

.github/workflows/omio_tests.yml

@@ -25,7 +25,7 @@ jobs:
           source "$(conda info --base)/etc/profile.d/conda.sh"
           conda activate omio
           pip install .
-          pip install pytest pytest-cov
+          pip install pytest pytest-cov coverage
 
       - name: Debug OMIO import
         run: |