Update validate-markdown.yaml

Author: ralfhandl

.github/workflows/validate-markdown.yaml

@@ -32,4 +32,5 @@ jobs:
         run: |
           export CHROME_DEVEL_SANDBOX=/opt/google/chrome/chrome-sandbox
           ls -l /opt/google/chrome/chrome-sandbox
+          stat -c "%a %n" /opt/google/chrome/chrome-sandbox
           npx --yes @umbrelladocs/linkspector check