# Use a small official Node.js image.
FROM node:22-alpine

# Set the working directory inside the container.
WORKDIR /app

# Copy package files first so Docker can cache dependency installs.
COPY package*.json ./

# Install production dependencies only.
RUN npm ci --omit=dev

# Copy the rest of the project files.
COPY . .

# Document the port used by the application.
EXPOSE 3001

# Start the Node.js server.
CMD ["npm", "start"]