# Simple Node.js Dockerfile
FROM node:18-alpine

WORKDIR /usr/src/app

# Install dependencies (use package-lock.json if present)
COPY src ./
RUN npm install --only=production

# Use a non-root user for safety
RUN addgroup -S app && adduser -S -G app app
USER app

EXPOSE 3000
ENV NODE_ENV=production

# Start the app (change to ["npm","start"] if you use an npm script)
CMD ["node", "main.js"]