Add support for using private docker registries
This is a general Merge Request template. Consider to choose a template from the list above if it will match your case more.
What does this MR do?
Adds support for passing docker authorization config with environment variable. This is a first step to add support for private registries (including private registry provided with GitLab CE/EE)
Why was this MR needed?
Are there points in the code the reviewer needs to double check?
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)
What are the relevant issue numbers?
References #1434 (closed), #1828 (closed) and gitlab-org/gitlab-ce#22305