anchor.diff:  
   # download and install Gradle
   # https://services.gradle.org/distributions/
  -ARG GRADLE_VERSION=7.1.1
  +ARG GRADLE_VERSION=7.2
   ARG GRADLE_DIST=bin
   RUN cd /opt && \
       wget -q https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-${GRADLE_DIST}.zip && \
  
positive.code: 
  # download and install Kotlin compiler
  # https://github.com/JetBrains/kotlin/releases/latest
  ARG KOTLIN_VERSION=1.5.21
  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: 
  # download and install Android SDK
  # https://developer.android.com/studio#command-tools
  ARG ANDROID_SDK_VERSION=7583922
  ENV ANDROID_SDK_ROOT /opt/android-sdk
  RUN mkdir -p ${ANDROID_SDK_ROOT}/cmdline-tools && \
      wget -q https://dl.google.com/android/repository/commandlinetools-linux-${ANDROID_SDK_VERSION}_latest.zip && \
  