Add PullPolicy config option for kubernetes
What does this MR do?
Allows the user so specify a image pull policy for build-images used (like with the docker executor).
Why was this MR needed?
May speed up CI steps when using versioned build images (rather than :latest)
Are there points in the code the reviewer needs to double check?
I'm unsure about the code duplication in common/config.go. Maybe it would be better/more clean to map the docker syntax for pull_policy to kubernetes values?
Does this MR meet the acceptance criteria?
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Documentation created/updated - Tests
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Added for this feature/bug -
All builds are passing
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Branch has no merge conflicts with master(if you do - rebase it please)