# Use an official node image as the base image
FROM node:16

# Set the working directory in the container
WORKDIR /app

# Copy the package.json and package-lock.json files
COPY package*.json ./

# Install the dependencies
RUN npm install

# Copy the rest of the application code
COPY . .

# Build the React app for production
RUN npm run build

# Install a simple HTTP server to serve static files
RUN npm install -g serve

# Set the command to run the HTTP server on the production build
CMD ["serve", "-s", "build"]

# Expose port 3000
EXPOSE 3000

why can we use node image to dockerize react app? it should be used to run node apps. also to write in command prompt of container we use cmd. so why we have used run npm install to install dependencies? it should ne cmd npm install.