FROM alpine:3.13

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

ENV dev_packages="ca-certificates build-base libffi-dev ruby-dev ruby-rdoc ruby-irb gcc make musl-dev"

RUN apk add --no-cache ruby ruby-json libffi libstdc++ ${dev_packages} \
    && rm -rf /var/cache/apk/*

ARG JEKYLL_VERSION
RUN gem install jekyll -v ${JEKYLL_VERSION} \
    && gem install jekyll-paginate \
    && gem install jekyll-auto-image \
    && gem install jekyll-tidy \
    && gem install jekyll-sitemap \
    && gem install bigdecimal

RUN apk del ${dev_packages}