anchor.diff:      apt-get install -y --no-install-recommends openssh-server supervisor locales && \
       mkdir -p /var/run/sshd /var/log/supervisord && \
       locale-gen en en_US en_US.UTF-8 && \
  -    apt-get remove -y locales && apt-get autoremove -y && \
  +    apt-get remove -y locales && apt-get autoremove -y  && \
  +    apt-get clean && rm -rf /var/lib/apt/list/* && \
       FILE_SSHD_CONFIG="/etc/ssh/sshd_config" && \
       echo "\nBanner /etc/ssh/sshd-banner" >> $FILE_SSHD_CONFIG && \
       echo "\nPermitUserEnvironment=yes" >> $FILE_SSHD_CONFIG && \
  
positive.code: 
  # download and install Kotlin compiler
  # https://github.com/JetBrains/kotlin/releases/latest
  ARG KOTLIN_VERSION=1.6.10
  RUN cd /opt && \
      wget -q https://github.com/JetBrains/kotlin/releases/download/v${KOTLIN_VERSION}/kotlin-compiler-${KOTLIN_VERSION}.zip && \
      unzip *kotlin*.zip && \
  
negative.code:     apt-get dist-upgrade -y && \
      apt-get install -y --no-install-recommends libncurses5:i386 libc6:i386 libstdc++6:i386 lib32gcc-s1 lib32ncurses6 lib32z1 zlib1g:i386 && \
      apt-get install -y --no-install-recommends openjdk-${JDK_VERSION}-jdk && \
      apt-get install -y --no-install-recommends git wget curl unzip zip && \
      DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends qt5-default && \
      apt-get clean && rm -rf /var/lib/apt/list/*
  
  # download and install Gradle
  # https://services.gradle.org/distributions/
  ARG GRADLE_VERSION=7.4.2
  ARG GRADLE_DIST=bin
  RUN cd /opt && \
      wget -q https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-${GRADLE_DIST}.zip && \
  