[windows] imgpkg does not retain file permissions

[DennisDenuto]

What steps did you take:
On Windows

git clone https://github.com/vmware-tanzu/carvel-imgpkg
cd carvel-imgpkg
imgpkg push -f ./test/assets/bundle_file_permissions -b some-image
imgpkg pull -b some-image -o ./extract-bundle

Expected ./extract-bundle/exec_file.sh
to have permissions: -rwx------
actual : -rw-rw-rw-

What happened:
None of the file permissions were retained

What did you expect:
file permissions to stay the same

Environment:

• imgpkg version (use imgpkg --version):
• Docker registry used (e.g. Docker HUB):
• OS (e.g. from /etc/os-release): Windows 10

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