ci: move fetch tests into 2e2

.github/workflows/e2e-integration-test.yml

@@ -66,3 +66,19 @@ jobs:
           ./lightpanda serve & echo $! > LPD.pid
           go run integration/main.go
           kill `cat LPD.pid`
+
+  browser-fetch:
+    name: browser fetch
+    needs: zig-build-release
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: lightpanda-build-release
+
+      - run: chmod a+x ./lightpanda
+
+      - run: ./lightpanda fetch https://demo-browser.lightpanda.io/campfire-commerce/