ci: Provide a workflow verifying an unprotected python script

emits 'hello voraus'.

This script will be protected later and the workflow altered to ensure it does not emit
without an AxProtector user runtime being present.

.github/workflows/ci.yml

@@ -11,3 +11,5 @@ jobs:
     uses: ./.github/workflows/ci_ubuntu_verify_repo.yml
   ubuntu_verify_installation:
     uses: ./.github/workflows/ci_ubuntu_verify_installation.yml
+  ubuntu_verify_protected_python:
+    uses: ./.github/workflows/ci_ubuntu_verify_protected_python.yml

.github/workflows/ci_ubuntu_verify_protected_python.yml

@@ -0,0 +1,14 @@
+name: CI ubuntu verify protected python
+'on':
+  workflow_call: null
+jobs:
+  python_script_is_protected:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, ubuntu-22.04, ubuntu-24.04]
+    steps:
+      - name: Checkout (GitHub)
+        uses: actions/checkout@v4
+      - name: Verify the unprotected script emits "hello voraus"
+        run: ./resources/greeting.py | grep -q "hello voraus"

resources/greeting.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+"""A executable module containing a greeter to be protected by AxProtector."""
+
+
+def greet_voraus() -> None:
+    """Greet voraus briefly."""
+    print("hello voraus")
+
+
+if __name__ == "__main__":
+    greet_voraus()