Dockerfile

# Stage: base image
FROM node:20.18-bookworm-slim as base

ARG BUILD_NUMBER
ARG GIT_REF
ARG GIT_BRANCH

LABEL maintainer="HMPPS Digital Studio <info@digital.justice.gov.uk>"

ENV TZ=Europe/London
RUN ln -snf "/usr/share/zoneinfo/$TZ" /etc/localtime && echo "$TZ" > /etc/timezone

RUN addgroup --gid 2000 --system appgroup && \
        adduser --uid 2000 --system appuser --gid 2000

WORKDIR /app

# Cache breaking and ensure required build / git args defined
RUN test -n "$BUILD_NUMBER" || (echo "BUILD_NUMBER not set" && false)
RUN test -n "$GIT_REF" || (echo "GIT_REF not set" && false)
RUN test -n "$GIT_BRANCH" || (echo "GIT_BRANCH not set" && false)

# Define env variables for runtime health / info
ENV BUILD_NUMBER=${BUILD_NUMBER}
ENV GIT_REF=${GIT_REF}
ENV GIT_BRANCH=${GIT_BRANCH}

RUN apt-get update && \
        apt-get upgrade -y && \
        apt-get autoremove -y && \
        rm -rf /var/lib/apt/lists/*

# Stage: build assets
FROM base as build

ARG BUILD_NUMBER
ARG GIT_REF
ARG GIT_BRANCH

COPY package*.json ./
RUN CYPRESS_INSTALL_BINARY=0 npm ci --no-audit

COPY . .
RUN npm run build

RUN npm prune --no-audit --omit=dev

# Stage: copy production assets and dependencies
FROM base

COPY --from=build --chown=appuser:appgroup \
        /app/package.json \
        /app/package-lock.json \
        ./

COPY --from=build --chown=appuser:appgroup \
        /app/assets ./assets

COPY --from=build --chown=appuser:appgroup \
        /app/dist ./dist

COPY --from=build --chown=appuser:appgroup \
        /app/node_modules ./node_modules

EXPOSE 3000
ENV NODE_ENV='production'
USER 2000

CMD [ "npm", "start" ]