bake build infra: nginx.conf (deterministic /ship for forks)

nginx.conf

@@ -0,0 +1,17 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # SPA fallback — client-side routing (react-router BrowserRouter)
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Long-cache hashed assets
+    location /assets/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}