FROM alpine:3.13

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

ENV DEV_PACKAGES="build-base libffi-dev ruby-dev ruby-rdoc ruby-irb gcc make musl-dev"

RUN apk add --no-cache ca-certificates ruby ruby-json libffi libstdc++ ${DEV_PACKAGES}

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 \
    && gem install kramdown-parser-gfm

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