# Use an official Node runtime as a parent image
FROM node:21-alpine

# Set the working directory in the container to /app
WORKDIR /app

# Copy package.json and package-lock.json before other files
# Utilise Docker cache to save re-installing dependencies if unchanged
COPY package*.json ./

# Install dependencies
RUN npm install

# Copy all files
COPY . .

# Build the app
RUN npm run build

# Serve the app on port 3000
EXPOSE 3000
CMD ["npm", "start"]