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: gyuho

.github/workflows/build.yml

@@ -7,6 +7,9 @@ on:
   pull_request:
     branches: ["**"]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-latest