Update playwright.yml

Author: d-oit

.github/workflows/playwright.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     env: 
       BASE_URL_TESTING: ${{ vars.BASE_URL_TESTING }}
-      CI: true
+      CI: 'true'
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3