Dockerfile

## Base ########################################################################

# Use a larger node image to do the build for native deps (e.g., gcc, python)
FROM node:lts as base

# Reduce npm log spam and colour during install within Docker
ENV NPM_CONFIG_LOGLEVEL=error
ENV NPM_CONFIG_COLOR=false

# We'll run the app as the `node` user, so put it in their home directory
WORKDIR /home/node/app

RUN chown -R node:node /home/node

# Copy the source code over
COPY --chown=node:node . /home/node/app/

## Development #################################################################

# Define a development target that installs devDeps and runs in dev mode
FROM base as development
WORKDIR /home/node/app

# Install (not ci) with dependencies, and for Linux vs. Linux Musl (which we use for -alpine)
RUN npm install

# Switch to the node user vs. root
USER node

# Expose port 3000
EXPOSE 3000

# Start the app in debug mode so we can attach the debugger
CMD ["npm", "start"]

## Production ##################################################################
# Also define a production target which doesn't use devDeps
FROM base as production
WORKDIR /home/node/app
COPY --chown=node:node --from=development /home/node/app/node_modules /home/node/app/node_modules

# Build the Docusaurus app
RUN npm run build

## Deploy ######################################################################

# Use a stable nginx image
FROM nginx:stable-alpine as deploy
WORKDIR /home/node/app

# Copy what we've installed/built from production
COPY  --from=production /home/node/app/build /usr/share/nginx/html/