Potential fix for code scanning alert no. 2: Workflow does not contain permissions

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

Author: cjeanner

.github/workflows/kustomize-build.yml

@@ -1,5 +1,7 @@
 ---
 name: kustomize-build
+permissions:
+  contents: read
 on:  # yamllint disable-line rule:truthy
   pull_request:
     branches: