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: Sirivasv

.github/workflows/dockerhub.yml

@@ -9,6 +9,8 @@ jobs:
   docker-build-and-publish:
     environment:
       name: dockerhub
+    permissions:
+      contents: read
     runs-on: ubuntu-latest
     steps:
       - name: Docker meta