anchor.diff:  
   RUN apt-get update \
     && apt-get install --no-install-recommends -y $OTBR_DOCKER_REQS $OTBR_DOCKER_DEPS \
  +  && ([ "${OT_BACKBONE_CI}" != "1" ] || apt-get install --no-install-recommends -y $OTBR_OT_BACKBONE_CI_DEPS) \
     && ln -fs /usr/share/zoneinfo/UTC /etc/localtime \
     && ./script/bootstrap \
     && ./script/setup \
  
positive.code:   libavahi-client-dev libboost-dev libboost-filesystem-dev libboost-system-dev libjsoncpp-dev
  
  # Required for OpenThread Backbone CI
  ENV OTBR_OT_BACKBONE_CI_DEPS curl ca-certificates
  
  # Required and installed during build (script/bootstrap) when RELEASE=1, could be removed
  ENV OTBR_NORELEASE_DEPS \
  
negative.code:     && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false $OTBR_BUILD_DEPS  \
      && ([ "${RELEASE}" = 1 ] ||  apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false "$OTBR_NORELEASE_DEPS";) \
      && rm -rf /var/lib/apt/lists/* \
    )
  
  ENTRYPOINT ["/app/etc/docker/docker_entrypoint.sh"]
  
  