ci: twister: store the list of python packages

Add a step to the #1 twister shard to upload the list of Python packages
used with the build.

Signed-off-by: Fabio Baltieri <[email protected]>

Author: fabiobaltieri

.github/workflows/twister.yaml

@@ -273,6 +273,19 @@ jobs:
             module_tests/twister.xml
             testplan.json
 
+      - if: matrix.subset == 1 && github.event_name == 'push'
+        name: Save the list of Python packages
+        run: |
+          pip3 freeze | tee requirements-freeze.txt
+
+      - if: matrix.subset == 1 && github.event_name == 'push'
+        name: Upload the list of Python packages
+        uses: actions/upload-artifact@v3
+        with:
+          name: Frozen PIP package set
+          path: |
+            requirements-freeze.txt
+
   twister-test-results:
     name: "Publish Unit Tests Results"
     env: