Jordan Harband 84079dbff3 [Tests] install_nvm_from_git: stop git background gc/maintenance racing with cleanup ...

The test's `rm -rf "$NVM_DIR"` intermittently failed with
`rm: cannot remove...: Directory not empty`
and aborted under `set -e`.
Cause: after the clone/fetch, git can spawn a detached background gc/maintenance process that keeps writing into the clone dir while `rm -rf` runs (a concurrent writer makes the final rmdir fail).
It is not egress- or version-related
(it reproduces with all endpoints allowed),
and it is environment-timing dependent
(recently became consistent on the GitHub runners).

Disable git's background work for the test (gc.autoDetach / maintenance.auto)
so all git operations finish synchronously, and retry the rm once as a safety net.

2026-06-03 20:12:26 -07:00

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