try using official playwright container for e2e testing

.gitea/workflows/pr.yml

@@ -40,6 +40,8 @@ jobs:
 
   e2e:
     runs-on: ubuntu-latest
+    container:
+      image: mcr.microsoft.com/playwright:v1.58.2-noble
     steps:
       - uses: actions/checkout@v6
 
@@ -52,9 +54,6 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
-      - name: Install Playwright browsers
-        run: npx playwright install --with-deps chromium
-
       - name: Generate dev cert
         run: ./scripts/gen-dev-cert.sh