Add Docker production setup

.dockerignore

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+node_modules
+.git
+deploy.log

Dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY . .
+
+EXPOSE 3005
+
+CMD ["node", "app.js"]

docker-compose.yml

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+version: "3.9"
+
+services:
+  plusfit24:
+    build: .
+    container_name: plusfit24
+    restart: always
+    ports:
+      - "3005:3005"
+    env_file:
+      - .env