Potential fix for pull request finding 'CodeQL / Workflow does not contain permissions'

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

.github/workflows/validate_issue.yml

@@ -3,6 +3,9 @@ on:
   issues:
     types: [opened, edited]
 
+permissions:
+  contents: read
+
 jobs:
   validate:
     runs-on: ubuntu-latest