create build-workflow-cli-installer-darwin and build-workflow-cli-installer-linux jobs

[bacongobbler]

This way we can start a job which will create self-installing packages, much like what we did for the deis v1 client and deisctl release process. Alternatively, if we can just copy over the existing jobs and change the repository target then we're golden.

See https://ci.deis.io/job/build-deis-cli-installer-darwin/ See https://ci.deis.io/job/build-deis-cli-installer-linux/