Add an example for testing a phoenix application with Gitlab CI
Originally opened at !5074 by @nahtnam.
What does this MR do?
Add an example on how to setup testing on phoenix
Are there points in the code the reviewer needs to double check?
Grammar and formatting
Why was this MR needed?
https://twitter.com/gitlab/status/749898132008337408
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated - Tests
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All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master(if you do - rebase it please) -
Squashed related commits together