Add relay server docker stack

Author: lihebi

compose/relay/README.md

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+# Setting up relay server
+
+A relay server is a thin public server on cloud provider, which routes traffic back to another server (probably under tailscale without public IP).
+
+Modify the IP in nginx.conf and setup this relay stack on the public server.
+
+On the real server machine, start up the stack.

compose/relay/docker-compose.yml

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+# Use postgres/example user/password credentials
+version: "3.5"
+
+services:
+  nginx:
+    image: nginx:1.15-alpine
+    restart: always
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./nginx:/etc/nginx/conf.d
+      - /etc/letsencrypt:/etc/letsencrypt
+      - /var/lib/letsencrypt:/var/lib/letsencrypt
+

compose/relay/nginx/nginx.conf

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+server {
+        listen 80;
+        listen [::]:80;
+        server_name relay.codepod.io;
+        return 301 https://$host$request_uri;
+        # location / {
+        #         proxy_pass http://100.90.127.27;
+        # }
+}
+
+server {
+        listen 443 ssl http2;
+        listen [::]:443 ssl http2;
+        server_name relay.codepod.io;
+
+        server_tokens off;
+
+        ssl_certificate /etc/letsencrypt/live/relay.codepod.io/fullchain.pem;
+        ssl_certificate_key /etc/letsencrypt/live/relay.codepod.io/privkey.pem;
+
+        location / {
+                proxy_pass https://100.90.127.27;
+                proxy_http_version 1.1;
+                proxy_set_header Upgrade $http_upgrade;
+                proxy_set_header Connection "upgrade";
+        }
+}