Potential fix for code scanning alert no. 3: Workflow does not contain permissions

adding to existing branch, existing PR for similar alert

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

Author: misfir3

.github/workflows/replica-tests.yml

@@ -1,4 +1,6 @@
 name: migration tests
+permissions:
+  contents: read
 
 on: [pull_request]