add a 'pip freeze' call in github workflow to view reqs versions

.github/workflows/push-pr_workflow.yml

@@ -95,6 +95,7 @@ jobs:
         python3 -m pip install --upgrade pip
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
         pip3 install -r requirements/dev.txt
+        pip freeze
     
     - name: Install singularity
       run: |