Add GitHub Actions workflow

.github/workflows/e2e-tests.yaml

@@ -0,0 +1,25 @@
+name: End-to-end tests
+on:
+  deployment_status:
+jobs:
+  run-e2e-tests:
+    name: Run
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: frontend
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version-file: ./frontend/.nvmrc
+      - name: Install dependencies
+        run: |
+          npm ci
+      - name: Run end-to-end tests via Cypress
+        env:
+          PUBLIC_URL: ${{ github.event.deployment_status.target_url }}
+        run: |
+          npm run test-only