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>

.github/workflows/docker.yml

@@ -6,6 +6,9 @@ on:
       - 'master'
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   docker:
     runs-on: ubuntu-latest