Dockerfile

# syntax=docker/dockerfile:1.0.0-experimental
# Stage 0, "build-stage" to build and compile the frontend
FROM node:20.10.0-alpine as build-stage

# ref: https://medium.com/@nodepractices/docker-best-practices-with-node-js-e044b78d8f67

RUN apk update && \
  apk upgrade && \
  apk add git && \
  apk add openssh-client

COPY package.json /app/
COPY package-lock.json /app/

WORKDIR /app

ARG GITHUB_TOKEN
RUN echo "//npm.pkg.github.com/:_authToken=${GITHUB_TOKEN}" > .npmrc && echo "@verifiedinc:registry=https://npm.pkg.github.com" >> .npmrc

RUN mkdir -p -m 0600 ~/.ssh && ssh-keyscan github.com >> ~/.ssh/known_hosts

# using "ci" to install dependencies strictly from the package-lock file
RUN --mount=type=ssh,id=github npm ci

COPY ./ /app/

# Remix generate different hashes for chunks with sourcemap flag on build.
RUN npm run build:sourcemap
# We must delete sourcemaps since is discouraged to keep them in production.
RUN npm run delete_sourcemaps

# remove local npm cache with "clean cache --force" because of the image's ummutable nature, no need for local cache (that lives in the image). Makes the overall image size smaller.
RUN npm cache clean --force

# bootstrapping using "node" (not using the npm start script) so that the running node process gets OS signals (e.g. SIGTERM) and can gracefully shut down
# CMD syntax ref: https://www.baeldung.com/linux/docker-cmd-multiple-commands#2-run-multiple-commands-with-the-exec-form
CMD ["/bin/sh", "-c", "npm run start"]