ruby:alpine with nokogori

Dockerfile

FROM ruby:alpine
MAINTAINER mizu <mizu.copo@gmail.com>

RUN set -x \
  && apk upgrade --no-cache \ 
  && apk add --no-cache --virtual build-dependencies \
    build-base \
  && apk add --no-cache \
    libxml2-dev \
    libxslt-dev \
  && gem install nokogiri \
    -- --use-system-libraries \
    --with-xml2-config=/usr/bin/xml2-config \
    --with-xslt-config=/usr/bin/xslt-config \
  && apk del build-dependencies