anchor.diff:  ENTRYPOINT /bin/bash
   
   ENV RUBY_VERSIONS="2.5.8 2.6.6 2.7.2 3.0.0" \
  +    OLDEST_RUBY_VERSION=2.5.8 \
  +    NEWEST_RUBY_VERSION=3.0.0 \
       DEFAULT_RUBY_VERSION=2.6.6 \
       BUNDLER1_VERSION=1.17.3 \
       BUNDLER2_VERSION=2.2.11 \
  
positive.code:     && apt-get -y autoclean
  
  # Install rbenv
  RUN git clone --depth=1 https://github.com/rbenv/rbenv.git /root/.rbenv \
      && cd /root/.rbenv \
      && src/configure \
      && make -C src
  ENV PATH /root/.rbenv/shims:/root/.rbenv/bin:$PATH
  RUN echo 'eval "$(rbenv init -)"' >> /etc/profile
  RUN echo 'eval "$(rbenv init -)"' >> .bashrc
  RUN mkdir -p "$(rbenv root)"/plugins \
  
negative.code:     && ln -s $(which python) /bin/python3
  
  # Install nodenv
  ENV NODENV_ROOT=/root/.nodenv
  RUN git clone --depth=1 https://github.com/nodenv/nodenv.git $NODENV_ROOT \
      && cd $NODENV_ROOT \
      && src/configure \
      && make -C src
  ENV PATH $NODENV_ROOT/shims:$NODENV_ROOT/bin:$PATH
  RUN echo 'export PATH="$HOME/.nodenv/bin:$PATH"' >> ~/.bashrc
  RUN echo 'eval "$(nodenv init -)"' >> ~/.bashrc
  RUN mkdir -p "$(nodenv root)"/plugins \
  