[windows] imgpkg does not have a deterministic push across OS

[DennisDenuto]

What steps did you take:

On Windows

> git clone https://github.com/vmware-tanzu/carvel-imgpkg
> cd carvel-imgpkg
> imgpkg push -i image-windows -f test/e2e/assets/simple-app --yes
Succeded pushing sha sha256:73e65af5e889da98ece0bd471b2cd83baac574e19943108212ba0417ff8f03c2

On Linux

> git clone https://github.com/vmware-tanzu/carvel-imgpkg
> cd carvel-imgpkg
> imgpkg push -i image-linux -f test/e2e/assets/simple-app --yes
Succeded pushing sha sha256:ceef30cbdce418efde0284f446df9cec9e535adcd6e1010dad30ddae1dc9367b

> imgpkg pull -i image-linux -o /tmp/linux
> imgpkg pull -i image-windows -o /tmp/windows

 ls -l /tmp/windows
total 48
-rw-------  1 dennisleon  wheel  11558 Dec 31  1969 LICENSE
-rw-------  1 dennisleon  wheel     98 Dec 31  1969 README.md
drwx------  2 dennisleon  wheel     64 Dec 31  1969 config
-rw-------  1 dennisleon  wheel     25 Dec 31  1969 config\config.yml
drwx------  2 dennisleon  wheel     64 Dec 31  1969 config\inner-dir
-rw-------  1 dennisleon  wheel      6 Dec 31  1969 config\inner-dir\README.txt

ls -l /tmp/linux
total 32
-rw-------  1 dennisleon  wheel  11357 Dec 31  1969 LICENSE
-rw-------  1 dennisleon  wheel     95 Dec 31  1969 README.md
drwx------  4 dennisleon  wheel    128 Oct  6 11:25 config

What happened: Image pushed resulted in a different sha (and different contents) across windows and linux

What did you expect: The same image pushed. Or a way to differentiate between an image built for windows vs linux. Using an Image Index perhaps?

Environment:

• imgpkg version (use imgpkg --version): 0.19.0
• Docker registry used (e.g. Docker HUB):
• OS (e.g. from /etc/os-release): Windows 10

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