fix: make verify-upstream-has-not-changed.sh executable after creation

Author: fleetingbytes

src/ci_starter/cli/__init__.py

@@ -101,6 +101,7 @@ def workflows(
     with workdir.helper_script.open("w", encoding="utf-8") as script_file:
         script: str = generate_helper_script()
         script_file.write(script)
+    _make_script_executable = workdir.helper_script.chmod(0o755)
 
     base_workflow_file = workdir.workflows / workflow_file_name.name
     with base_workflow_file.open("w", encoding="utf-8") as base_workflow: