container:
  image: debian:stretch-slim
  options: "--name ci-container -v /usr/bin/docker:/tmp/docker:ro"

steps:
  - script: |
      /tmp/docker exec -t -u 0 ci-container \
      sh -c "apt-get update && DEBIAN_FRONTEND=noninteractive apt-get -o Dpkg::Options::="--force-confold" -y install sudo"
    displayName: Set up sudo