Dockerfile

#
# Base layer that both dev and runtime inherit from.
#
FROM ruby:3.4.5-alpine AS devdocs-base
ENV LANG=C.UTF-8

ARG USERNAME=devdocs
ARG USER_ID=1000
ARG GROUP_ID=1000
WORKDIR /devdocs
EXPOSE 9292

COPY Gemfile Gemfile.lock Rakefile Thorfile /devdocs/

RUN apk --update add nodejs build-base libstdc++ gzip git zlib-dev libcurl oxipng && \
    rm -rf /var/cache/apk/* /usr/lib/node_modules

RUN gem install bundler && \
    bundle config set path.system true && \
    bundle config set without test && \
    bundle install && \
    rm -rf ~/.gem /root/.bundle/cache /usr/local/bundle/cache

RUN addgroup -g $GROUP_ID $USERNAME && \
    adduser -u $USER_ID -G $USERNAME -D -h /devdocs $USERNAME && \
    chown -R $USERNAME:$USERNAME /devdocs

#
# Development Image
#
FROM devdocs-base AS devdocs-dev
RUN bundle config unset without && \
    bundle install && \
    apk add --update bash curl && \
    curl -LO https://download.docker.com/linux/static/stable/x86_64/docker-26.1.4.tgz && \
    tar -xzf docker-26.1.4.tgz && \
    mv docker/docker /usr/bin && \
    rm -rf docker docker-26.1.4.tgz && \
    rm -rf ~/.gem /root/.bundle/cache /usr/local/bundle/cache

VOLUME [ "/devdocs",  "/devdocs/public/docs", "/devdocs/public/assets" ]
CMD ["bash"]

#
# Runtime Image
#
FROM devdocs-base AS devdocs
ENV ENABLE_SERVICE_WORKER=true
COPY . /devdocs/
RUN apk del gzip build-base git zlib-dev && \
    chown -R $USERNAME:$USERNAME /devdocs && \
    rm -rf /tmp
VOLUME [ "/devdocs/public/docs", "/devdocs/public/assets" ]
USER $USERNAME
CMD ["rackup", "--host", "0.0.0.0", "-E", "production"]