Install docker daemon in the image. Uses init scripts for the official repository.
This plugin can only be used if the distribution being bootstrapped is
wheezy, as Docker needs a kernel version
3.8 or higher,
which is available at the
wheezy-backports repository. There’s also
an architecture requirement, as it runs only on
version: Selects the docker version to install. To select the latest version simply omit this setting. Default: