feat: add reverse proxy

Author: elcharitas

udagram-reverseproxy/Dockerfile

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+FROM nginx:alpine
+COPY nginx.conf /etc/nginx/nginx.conf

udagram-reverseproxy/nginx.conf

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+worker_processes 1;  
+events { worker_connections 1024; }
+error_log /dev/stdout debug;
+http {
+ sendfile on;
+ upstream user {
+     server backend-user:8080;
+ }
+ upstream feed {
+     server backend-feed:8080;
+ }
+ proxy_set_header   Host $host;
+ proxy_set_header   X-Real-IP $remote_addr;
+ proxy_set_header   X-NginX-Proxy true;
+ proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
+ proxy_set_header   X-Forwarded-Host $server_name;    
+ server {
+     listen 8080;
+     location /api/v0/feed {
+         proxy_pass         http://feed;
+     }
+     location /api/v0/users {
+         proxy_pass         http://user;
+     }            
+ }
+}