It builds. Needs testing

nginx/Dockerfile

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+FROM nginx:latest
+MAINTAINER tanshu
+
+COPY brew.conf /etc/nginx/conf.d/default.conf

nginx/brew.conf

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+server {
+
+    listen 80;
+    server_name example.org;
+    charset utf-8;
+
+    location / {
+        proxy_pass http://web:80;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    }
+}