FROM docker.io/library/ruby:3.3 AS builder
WORKDIR /srv/jekyll
COPY Gemfile* ./
RUN bundle install

FROM docker.io/library/ruby:3.3-slim
WORKDIR /srv/jekyll
COPY --from=builder /usr/local/bundle /usr/local/bundle
COPY --from=builder /srv/jekyll /srv/jekyll
CMD ["bundle", "exec", "jekyll", "build"]