Dockerfile

# Use the official Node.js 18 LTS image
FROM node:18-alpine

# Set the working directory inside the container
WORKDIR /usr/src/app

# Copy package.json and package-lock.json (if available)
COPY package*.json ./

# Install dependencies (including devDependencies for development)
ARG NODE_ENV=production
RUN if [ "$NODE_ENV" = "development" ] ; then npm ci ; else npm ci --only=production ; fi && npm cache clean --force

# Create a non-root user to run the application
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nodejs -u 1001

# Copy the rest of the application code
COPY . .

# Change ownership of the app directory to the nodejs user
RUN chown -R nodejs:nodejs /usr/src/app

# Switch to the non-root user
USER nodejs

# Expose the port the app runs on
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD node healthcheck.js || exit 1

# Start the application
CMD ["npm", "start"]