anchor.diff:      BITRISE_CACHE_DIR="/bitrise/cache" \
       BITRISE_PREP_DIR="/bitrise/prep" \
       BITRISE_TMP_DIR="/bitrise/tmp" \
  -
   # Configs - tool versions
       TOOL_VER_BITRISE_CLI="1.17.0" \
       TOOL_VER_RUBY="2.5.1" \
       TOOL_VER_GO="1.10.3" \
  -    TOOL_VER_DOCKER="17.12.0" \
  -    TOOL_VER_DOCKER_COMPOSE="1.19.0"
  +    TOOL_VER_DOCKER="18.03.1" \
  +    TOOL_VER_DOCKER_COMPOSE="1.21.2"
   
   # create base dirs
   RUN mkdir -p ${BITRISE_SOURCE_DIR} \
  
positive.code: # For available docker-ce versions
  #  you can run `sudo apt-get update && sudo apt-cache policy docker-ce`
   && DEBIAN_FRONTEND=noninteractive apt-get install -y \
      docker-ce=${TOOL_VER_DOCKER}~ce-0~ubuntu
  
  
  # docker-compose
  
negative.code: FROM ubuntu:18.04
  
  
  # ------------------------------------------------------
  