[CI] Add Workflow permissions to PR tests (#13233)

[CI] Add workflow permissions to PR tests

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: DN6

.github/workflows/pr_tests.yml

@@ -16,6 +16,9 @@ on:
     branches:
       - ci-*
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true