Add Docker and Nginx config for frontend, backend, and MongoDB

Backend/.dockerignore

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+node_modules
+npm-debug.log
+.env
+data

Backend/Dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY . .
+
+ENV NODE_ENV=production
+ENV PORT=4000
+
+EXPOSE 4000
+
+CMD ["node", "index.js"]

docker-compose.yml

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+services:
+  frontend:
+    image: francesco448/chat-app-frontend:latest
+    build:
+      context: ./frontend
+      args:
+        VITE_API_URL: ""
+    restart: unless-stopped
+    depends_on:
+      - backend
+    ports:
+      - "80:80"
+    networks:
+      - chat-network
+
+  backend:
+    image: francesco448/chat-app-backend:latest
+    build:
+      context: ./Backend
+    restart: unless-stopped
+    depends_on:
+      mongo:
+        condition: service_healthy
+    environment:
+      - PORT=4000
+      - CLIENT_ORIGIN=http://localhost
+      - DATA_STORE=mongo
+      - MONGO_URI=mongodb://${MONGO_ROOT_USER:-admin}:${MONGO_ROOT_PASSWORD:-chatpass}@mongo:27017/${MONGO_DB:-chatapp}?authSource=admin
+      - MONGO_DB=${MONGO_DB:-chatapp}
+    networks:
+      - chat-network
+
+  mongo:
+    image: mongo:7
+    container_name: chat-app-mongo
+    restart: unless-stopped
+    environment:
+      - MONGO_INITDB_ROOT_USERNAME=${MONGO_ROOT_USER:-admin}
+      - MONGO_INITDB_ROOT_PASSWORD=${MONGO_ROOT_PASSWORD:-chatpass}
+      - MONGO_INITDB_DATABASE=${MONGO_DB:-chatapp}
+    volumes:
+      - mongo-data:/data/db
+    ports:
+      - "27017:27017"
+    networks:
+      - chat-network
+    healthcheck:
+      test: ["CMD", "mongosh", "--eval", "db.adminCommand('ping')"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+networks:
+  chat-network:
+    driver: bridge
+
+volumes:
+  mongo-data:
+    driver: local

frontend/.dockerignore

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+node_modules
+dist
+npm-debug.log
+.env

frontend/Dockerfile

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+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+
+
+ARG VITE_API_URL=""
+ENV VITE_API_URL=$VITE_API_URL
+
+RUN npm run build
+
+FROM nginx:alpine
+
+COPY --from=builder /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]

frontend/nginx.conf

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+server {
+    listen 80;
+
+    # Serve the static React build
+    location / {
+        root /usr/share/nginx/html;
+        index index.html;
+        # Fallback to index.html for client-side routing
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Proxy REST API requests to the backend
+    location /rooms {
+        proxy_pass http://backend:4000;
+        proxy_http_version 1.1;
+        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 the health check endpoint to the backend
+    location /health {
+        proxy_pass http://backend:4000;
+        proxy_http_version 1.1;
+    }
+
+    # Proxy Socket.IO — requires WebSocket upgrade headers
+    location /socket.io/ {
+        proxy_pass http://backend:4000;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_cache_bypass $http_upgrade;
+    }
+}