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gitserver: set gc.auto 0 if we are managing git gc

Administrator requested to merge sh/gc-auto-0 into main

Created by: stefanhengl

This disables background garbage collection on a repository level.

We keep getting reports of corrupted repos, most likely because sg maintenance runs at the same time as a background git-gc job.

We already disabled garbage collection for our fetch commands but apparently that wasn't enough.

Test plan

  • existing unit tests
  • I ran a local instance of sourcegraph and verified that all repos in .sourcegraph/repos/ had the config set after the first cleanup run.

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