Potential fix for code scanning alert no. 14: Workflow does not contain permissions (#250)

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

Author: arunim2405

.github/workflows/coverage.yml

@@ -1,5 +1,7 @@
 name: Coverage
 on: [push, pull_request]
+permissions:
+  contents: read
 jobs:
   coverage:
     runs-on: ubuntu-latest