feat: add dockerized demo deployment

nginx/default.conf

@@ -0,0 +1,35 @@
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    '' close;
+}
+
+map $http_x_forwarded_proto $forwarded_proto {
+    default $http_x_forwarded_proto;
+    '' $scheme;
+}
+
+upstream chatroom_app {
+    server chatroom-app:8000;
+}
+
+server {
+    listen 80;
+    server_name _;
+
+    location / {
+        proxy_pass http://chatroom_app;
+        proxy_http_version 1.1;
+
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection $connection_upgrade;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $forwarded_proto;
+        proxy_set_header X-Forwarded-Host $host;
+        proxy_set_header X-Forwarded-Port $server_port;
+
+        proxy_read_timeout 3600s;
+        proxy_send_timeout 3600s;
+    }
+}