feat: add frontend end-to-end testing stage in CI pipeline

.gitlab-ci.yml

@@ -30,6 +30,16 @@ frontend-test:
     - bun run typecheck
     - bun run test --coverage --watch=false
 
+frontend-e2e:
+  stage: test
+  image: mcr.microsoft.com/playwright:v1.61.1-noble
+  interruptible: true
+  script:
+    - npm install -g bun
+    - cd frontend
+    - bun install --frozen-lockfile
+    - bun run e2e
+
 .publish-image:
   stage: publish
   image: quay.io/buildah/stable:latest