ci: add e2e vercel test action (#2054)

* ci: add e2e vercel test action

This commit adds several end-to-end tests that can be used
to test whether the Vercel Preview deployment successfully
returns the cards.

* test: add additional e2e card tests

* test: improve e2e card tests

This commit makes sure that the tests also check whether a valid cards
are returned from the preview deployment.

.github/workflows/e2e-test.yml

@@ -0,0 +1,20 @@
+name: Test Deployment
+on:
+  deployment_status:
+
+jobs:
+  preview:
+    if:
+      github.event_name == 'deployment_status' &&
+      github.event.deployment_status.state == 'success'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install dependencies
+        run: npm ci
+        env:
+          CI: true
+      - name: Run end-to-end tests.
+        run: npm run test:e2e
+        env:
+          VERCEL_PREVIEW_URL: ${{ github.event.deployment_status.target_url }}