Potential fix for code scanning alert no. 10: Workflow does not contain permissions (#3527)

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

Author: melloware

.github/workflows/deploy-doc.yaml

@@ -5,6 +5,8 @@ on:
       - master
     paths:
       - 'docs/**'
+permissions:
+  contents: read
 jobs:
   deploy-to-cloudflare:
     name: Deploy to Cloudflare