multi-stage builds

Dockerfile

# Use the Node LTS image
# Step 1: Building our application
FROM node:lts-alpine AS builder

# Copying the project repo to the builder images default working directory /root
COPY . .

# Installing JS dependencies
RUN yarn

# Building the app
RUN yarn build

# Step 2: Serving our application with Nginx
FROM nginx

# Setting default working directory to public Nginx directory
WORKDIR /usr/share/nginx/html

# Copy files from `builder` /build directory
# to the nginx images root working directory
COPY --from=builder /build .

# Expose port 80 on the Nginx images 
EXPOSE 80