Replace io.Copy with stdcopy.StdCopy for docker output handling
What does this MR do?
Replaces io.Copy() with github.com/docker/docker/pkg/stdcopy.StdCopy() while handling docker output.
Why was this MR needed?
Fixes regression introduced with !301 (merged). Please read https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/merge_requests/301#note_24583712 for a reference.
Thanks @ayufan for pointing to this function :)
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)