Investigate k8s Job objects for GitLab Migration
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## Introduction
From [this comment](https://gitlab.com/gitlab-org/gitlab/-/issues/332616#note_599296577):
>Some sidekiq jobs would make great candidates for use as a Job object in Kubernetes. Project/Repository imports and exports would be prime candidates.
## Proposal
Investigate the possibility of using [Kubernetes Job](https://kubernetes.io/docs/concepts/workloads/controllers/job/) objects in k8s for GitLab Migration.
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