When copying a bundle that have images in a private registry copy fails

[joaopapereira]

What steps did you take:
Scenario: When a bundle has images that are in a private repository, copy the bundle to a different registry. When trying to copy the bundle again, imgpkg reaches the original location instead of the location the bundle is being copied from.

Private repository:
repo.io/my-img

1. Push bundle to public.repo.io/my-bundle that includes repo.io/my-img
2. Copy bundle from public.repo.io/my-bundle to different.repo.io/my-bundle
3. Try to copy different.repo.io/my-bundle to yet-another.repo.io/my-bundle

What happened:
imgpkg tries to check if the images are bundles, based on the original location instead of using the PrimaryLocation() function.

What did you expect:
imgpkg should try to check if an image is a bundle, based on the primary location, which first is the same repository as the bundle, and only after should check it from the original location.

Anything else you would like to add:
The problem starts in https://github.com/vmware-tanzu/carvel-imgpkg/blob/develop/pkg/imgpkg/bundle/bundle_images_lock.go#L41

Environment:

• imgpkg version (use imgpkg --version): 0.7.0
• Docker registry used (e.g. Docker HUB): gcr.io
• OS (e.g. from /etc/os-release): macOS Big Sur

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[joaopapereira]

Released in version 0.8.0