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
RUN apt-get update && apt-get install -y git && apt-get clean && rm -rf /var/lib/apt/lists/*
WORKDIR /srv/jekyll
COPY --from=builder /usr/local/bundle /usr/local/bundle
COPY --from=builder /srv/jekyll /srv/jekyll
CMD ["bundle", "exec", "jekyll", "build"]