Potential fix for code scanning alert no. 13: Workflow does not contain permissions (#579)

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: Slashgear

.github/workflows/playwright.yml

@@ -4,6 +4,8 @@ on:
   push:
     branches:
       - 'master'
+permissions:
+  contents: read
 
 jobs:
   test: