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>
Signed-off-by: Tuan Duc Tran <tuanductran.dev@gmail.com>

Author: tuanductran

.github/workflows/validate-rules.yml

@@ -8,6 +8,8 @@ on:
 
 jobs:
   validate:
+    permissions:
+      contents: read
     runs-on: ubuntu-latest
 
     steps: