Potential fix for code scanning alert no. 114: Workflow does not contain permissions (#278)

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

Author: Pangjiping

.github/workflows/egress-test.yaml.yml

@@ -7,6 +7,9 @@ on:
       - 'components/egress/**'
       - 'components/internal/**'
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true