FROM ruby:2.4-alpine COPY Gemfile /webapp/ RUN \ apk --no-cache -t .dev add build-base git && \ cd /webapp && \ bundle && \ bundle install && \ apk del .dev && \ apk --no-cache add libcurl COPY app.rb /webapp/ COPY public /webapp/public COPY views /webapp/views WORKDIR /webapp EXPOSE 4567 CMD ["ruby", "app.rb"]