anchor.diff:      ca-certificates \
       git \
       ruby && \
  +  gem install --no-ri --no-rdoc \
  +    bundler --version '~> 1.13' && \
     rm -rf /var/cache/apk/*
   
   # Install gems
  +RUN echo 'gem: --no-rdoc --no-ri' > ~/.gemrc
  +COPY drone-chef.gemspec drone-chef.gemspec
  +COPY Gemfile Gemfile
   RUN apk update && \
     apk add \
       ruby-dev \
  
positive.code:     perl && \
    rm -rf /var/cache/apk/*
  
  COPY pkg/drone-chef-0.0.0.gem /tmp/
  
  RUN gem install --no-ri --no-rdoc --local \
    /tmp/drone-chef-0.0.0.gem
  
  
negative.code:     perl \
      libffi-dev \
      bash && \
    # Required for bundler
    gem install --no-ri --no-rdoc \
      io-console --version '~> 0.4' && \
    bundle install --without development test && \
    apk del \
      ruby-dev \
      build-base \
  