Caching Shippable build minons, as illustrated in this sample, reduces the time required to run future builds. The cached minion already has all the gems installed, so the install section only checks that they are already there and does not take the time to reinstall them the next time the cached minion builds the project. Specifying "no cache" in the commit message will reset the cached container.
For more detailed information, please see Shippable's documentation at http://docs.shippable.com/en/latest/config.html.
This sample is built for Shippable, a docker based continuous integration and deployment platform.