Verified Commit 20f79920 authored by
Backport gitlab-ci-yml!128 - Fix kubectl version to 1.8.6
This commit extracts `kubectl`, `helm` and `codeclimate` versions as CI variables. `kubectl` changes from latest stable version to `1.8.6`, the other two are just extracted in order to be easily updated; now we can also test tool upgrades overriding CI secret variables.
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