FROM ruby:2.5.1-alpine ENV LANG=C.UTF-8 WORKDIR /devdocs COPY . /devdocs RUN apk --update add nodejs build-base libstdc++ gzip git zlib-dev && \    gem install bundler && \    bundle install --system --without test && \    thor docs:download --all && \    thor assets:compile && \    apk del gzip build-base git zlib-dev && \    rm -rf /var/cache/apk/* /tmp ~/.gem /root/.bundle/cache \    /usr/local/bundle/cache /usr/lib/node_modules EXPOSE 9292CMD rackup -o 0.0.0.0