machinery installs machinery, a CLI to create and manage Docker machine
clusters.
The machinery step arranges for the Docker machinery CLI to be present at
the host. machinery combines machine, compose and docker to create and
manage clusters and their applications lifecycles. The step is able to pinpoint
a given branch from the git repo. The branch will be checked out under the
default opt directory of primer so that several branches could coexist. At
the time of the installation, the main script from the branch is made available
under the bin directory of primer.
Version of machinery to install. This defaults to the master branch.
This environment variable is the same as the --branch option.