Add permissions block to CI workflow for security

Co-authored-by: FTWinston <1863145+FTWinston@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -11,6 +11,8 @@ on:
 jobs:
   build-and-test:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
 
     steps:
       - name: Checkout code