Run if Preflight completes, only give READ permissions

Author: BMatischen01

.github/workflows/check-dead-links.yaml

@@ -4,10 +4,13 @@ name: Check Markdown links
 # access to secrets
 on:
   workflow_run:
-    workflows: ["Receive Pull Request"]
+    workflows: ["Pull Request Preflight Check"]
     types:
       - completed
 
+permissions:
+    contents: read
+
 jobs:
   markdown-link-check:
     runs-on: ubuntu-latest