Speeding up Travis CI Docker builds

Node.js
Docker
Continuous Integration
Having the possibility to run an application tests inside Docker containers is great, but it comes at a cost: builds tends to be slow, especially if the application requires multiple Docker containers. Fortunately, since May of 2016, Travis CI provides cache support for open source repositories (it was only available for private repos until then). This post will demonstrate how to use that feature to improve our builds speed.
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