Added test to check installed packages

Author: fungss

.github/workflows/ci.yaml

@@ -1,6 +1,7 @@
 name: CI
 
 on:
+  push:
   pull_request:
 
 jobs:
@@ -30,6 +31,10 @@ jobs:
         run: | 
           python -m pip install -r requirements.txt
 
+      - name: Check installed packages
+        run: |
+          python freeze -r requirements.txt
+
       - name: Run tests
         run: |
           python -m unittest discover -v