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>

Author: yau-wd

.github/workflows/docker-image-dockerhub.yml

@@ -17,6 +17,9 @@ on:
                 required: true
                 default: 'latest'
 
+permissions:
+    contents: read
+
 jobs:
     prepare:
         runs-on: ubuntu-latest