add helper_image option to docker executor config
What does this MR do?
Add helper_image
config option to docker executor
Why was this MR needed?
We actively use git-lfs in our projects. Currently git-lfs version change impossible without upgrade of gitlab-runner.
But we need to regulary upgrade git and git-lfs for performance improvements and bug fixes. This MR allows us to have internal docker image based on gitlab/gitlab-runner-helper
with latest versions for git and git-lfs.
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?
Edited by Vitaliy Zakharov