Allow admins to override image:kubernetes:user value
## Description Recently gitlab-org/gitlab-runner!5469 was merged that allows users to define a uid and gid for a container being run in kubernetes. From the MR, the user setting overrides the value configured by administrators. Instead, administrators should be able to supersede any user-defined options. ## Proposal Reverse the order of precedence for the `image:kubernetes:user` and `image:kubernetes:group` values so that administrators can lock the jobs being run to a single user namespace. From customer feedback: > Ideally we want a setting like: ``` allowed_users = [">1", "1000-2000"] allowed_groups ["0", ">1000"] ``` ## Links to related issues and merge requests / references gitlab-org/gitlab-runner!5469
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