| 12345678910111213141516171819202122 | sudo: requiredservices:  - dockerenv:    global:        - DOCKER_VERSION=1.12.1-0~trustybefore_install:  # list docker-engine versions  - apt-cache madison docker-engine  # upgrade docker-engine to specific version  - sudo apt-get -o Dpkg::Options::="--force-confnew" install -y docker-engine=${DOCKER_VERSION}  - docker version  - docker info  - sudo add-apt-repository ppa:duggan/bats --yes  - sudo apt-get update -qq  - sudo apt-get install -qq bats  - make update-dependenciesscript:  - make test
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