* fix(rootfs): pass GIT_FIXED_WORKDIR inline to fetch_from_repo
Instead of using 'export GIT_FIXED_WORKDIR' and then 'unset' after,
pass the variable inline to the fetch_from_repo call. This ensures
the variable only exists in the context of that specific command
and doesn't leak into subsequent calls.
This follows the same pattern used in uboot-git.sh and kernel-git.sh.
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Co-authored-by: Viacheslav Bocharov <adeep@lexina.in>
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