Chore: Use a local http server instead of external to reduce flakiness (#11916)

docker/compose/test-nginx.conf

@@ -0,0 +1,14 @@
+server {
+    listen 8080;
+    server_name localhost;
+
+    root /usr/share/nginx/html;
+
+    # Enable CORS for test requests
+    add_header 'Access-Control-Allow-Origin' '*' always;
+    add_header 'Access-Control-Allow-Methods' 'GET, HEAD, OPTIONS' always;
+
+    location / {
+        try_files $uri $uri/ =404;
+    }
+}