Provision rust_brown container for Jenkins CD

Summary:
This container is intended to build documentation for rLF.

Ref T1406

Test Plan: salt equatower state.apply roles/paas-docker/containers/jenkins_slave

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1406

Differential Revision: http://devcentral.nasqueron.org/D1745