Add Dockerfiles and docker-compose for local deployment

backend/Dockerfile

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+FROM node:18-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+
+EXPOSE 5000
+
+CMD ["node", "server.js"]

docker-compose.yml

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+version: '3.8'
+
+services:
+  frontend:
+    build:
+      context: ./frontend
+      args:
+        - REACT_APP_API_URL=http://localhost:9501
+    ports:
+      - "9500:80"
+    depends_on:
+      - backend
+
+  backend:
+    build:
+      context: ./backend
+    ports:
+      - "9501:5000"
+    environment:
+      - PORT=5000
+      - MONGO_URI=mongodb://mongo:27017/elixify
+      # The rest are read from backend/.env or can be defined here
+    env_file:
+      - ./backend/.env
+    depends_on:
+      - mongo
+
+  mongo:
+    image: mongo:latest
+    ports:
+      - "9502:27017"
+    volumes:
+      - mongo-data:/data/db
+
+volumes:
+  mongo-data:

frontend/Dockerfile

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+# Build stage
+FROM node:18-alpine as build
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+
+# We inject the API URL for production build so nginx serves the correct config
+ARG REACT_APP_API_URL
+ENV REACT_APP_API_URL=$REACT_APP_API_URL
+
+RUN npm run build
+
+# Serve stage
+FROM nginx:alpine
+
+COPY --from=build /app/build /usr/share/nginx/html
+
+# Expose port 80 for Nginx
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]