Add explicit permissions to GitHub Actions workflow for security

Co-authored-by: DRSDavidSoft <4673812+DRSDavidSoft@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -10,6 +10,9 @@ jobs:
   build-and-test:
     runs-on: ubuntu-latest
 
+    permissions:
+      contents: read
+    
     steps:
     - name: Checkout code
       uses: actions/checkout@v4