Potential fix for code scanning alert no. 1: Workflow does not contain permissions (#534)

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

.github/workflows/ci.yml

@@ -1,5 +1,7 @@
 name: ci
 on: [push, pull_request]
+permissions:
+  contents: read
 
 jobs:
   build: