FROM alpine:3.4 

MAINTAINER Hanjo Meinhardt <hanjo@bunix.de>

ENV dev_packages="ca-certificates build-base libffi-dev ruby-dev ruby-rdoc ruby-irb"
  
RUN apk update && apk upgrade
  
RUN apk add ruby ruby-json ${dev_packages}
  
RUN rm -rf /var/cache/apk/*

RUN gem install jekyll
RUN gem install jekyll-paginate
RUN gem install jekyll-auto-image
RUN gem install jekyll-tidy
RUN gem install jekyll-sitemap
  
RUN apk del ${dev_packages}