files_service.CreateCommitStatus must not explicitly call
gitRepo.Close(), it will be called by the closer function.
Calling it explicitly will cause the repository to be closed
prematurely when obtained from the context, making it unusuable by the
caller later on.
For instance, as CreateCommitStatus is called indirectly when a
workflow exists for the tag to be created, it will make the repositoryn
in the context unusable for the tag creation API.
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