Potential fix for code scanning alert no. 1: Workflow does not contain permissions

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

Author: tmokmss

.github/workflows/build.yml

@@ -5,6 +5,8 @@ on:
       - main
   workflow_dispatch:
   pull_request:
+permissions:
+  contents: read
 jobs:
   Build-and-Test-CDK:
     runs-on: ubuntu-latest