Ground work for Kubernetes config files dropdown
What does this MR do?
Add support for another file template dropdown, Kubernetes
Screenshots (if relevant)
TBD
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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What are the relevant issue numbers?
Fixes gitlab-org/gitlab-ce#21486