feat: add dockerized demo deployment

docker-compose.yml

@@ -0,0 +1,30 @@
+services:
+  chatroom-app:
+    build:
+      context: .
+    image: chatroom-app:demo
+    restart: unless-stopped
+    expose:
+      - "8000"
+    networks:
+      - chatroom_internal
+
+  chatroom-nginx:
+    image: nginx:alpine
+    restart: unless-stopped
+    depends_on:
+      - chatroom-app
+    expose:
+      - "80"
+    volumes:
+      - ./nginx/default.conf:/etc/nginx/conf.d/default.conf:ro
+    networks:
+      - chatroom_internal
+      - caddy_proxy
+
+networks:
+  chatroom_internal:
+    driver: bridge
+  caddy_proxy:
+    external: true
+    name: caddy_proxy