Add Docker files

Dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+
+EXPOSE 3000
+
+CMD ["npm", "start"]

docker-compose.yml

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+version: '3.8'
+
+services:
+  app:
+    build: .
+    ports:
+      - "3000:3000"
+    env_file:
+      - .env
+    depends_on:
+      - db
+    volumes:
+      - .:/app
+      - /app/node_modules
+
+  db:
+    image: postgres:16
+    restart: always
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB}
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+
+volumes:
+  postgres_data: