Workflow: Add comment to runner os check

Author: lamATnginx

.github/workflows/playwright.yml

@@ -52,6 +52,7 @@ jobs:
             run: git config --global --add safe.directory /__w/nginx-hugo-theme/nginx-hugo-theme
           - name: Run Playwright tests
             id: test-ui
+            # Check done to set the home variable. Workaround as browser is unable to launch if the $HOME folder isn't owned by the current user.
             if:  ${{ runner.os == 'Linux' }}
             env:
               HOME: /root