Potential fix for code scanning alert no. 5: Workflow does not contain permissions

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

Author: ilopezluna

.github/workflows/e2e-tests.yml

@@ -11,6 +11,9 @@ on:
         required: false
         default: "ai/smollm2"
 
+permissions:
+  contents: read
+
 jobs:
   e2e-shell-tests:
     runs-on: ${{ matrix.os }}