add nginx configuration to Dockerfile

Change-Id: Ib5617f589956a7bb778335416ae7d69f11d486ae
diff --git a/nginx.conf b/nginx.conf
new file mode 100644
index 0000000..dd6cedc
--- /dev/null
+++ b/nginx.conf
@@ -0,0 +1,20 @@
+worker_processes 1;
+events { worker_connections 1024; }
+
+http {
+    include       mime.types;
+    default_type  application/octet-stream;
+
+    sendfile        on;
+    keepalive_timeout  65;
+
+    server {
+        listen 8082;
+
+        # 1. 代理静态资源:如 http://localhost/static/index.html
+        location /upload/ {
+            alias /app/upload/;
+            autoindex on;
+        }
+    }
+}