ARG RUBY_VERSION
FROM ruby:${RUBY_VERSION}

LABEL org.opencontainers.image.authors="hanjo@bunix.de"

ENV DEV_PACKAGES="build-base libffi-dev"
RUN apk add --no-cache ${DEV_PACKAGES}


ARG JEKYLL_VERSION
RUN gem install jekyll -v ${JEKYLL_VERSION} --no-document \
    && gem install jekyll-paginate --no-document \
    && gem install jekyll-auto-image --no-document \
    && gem install jekyll-tidy --no-document \
    && gem install jekyll-sitemap --no-document \
    && gem install jekyll-node-module --no-document \
    && gem install bigdecimal --no-document \
    && gem install kramdown-parser-gfm --no-document \
    && gem install webrick --no-document

RUN apk del ${DEV_PACKAGES} \
    && rm -rf /var/cache/apk/*