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>
Signed-off-by: Alex Wichmann <VisualBean@users.noreply.github.com>

Author: VisualBean

.github/workflows/do_not_merge.yml

@@ -4,6 +4,9 @@ on:
   pull_request:
     types: [opened, reopened, labeled, unlabeled, synchronize, edited, ready_for_review]
 
+permissions:
+  contents: read
+
 jobs:
   block:
     name: Block if do not merge