Describe the problem/challenge you have

I need to be able to add multiple tags to an image when using imgpkg push -i. For example, I would use an explicit tag based on version or a sha, but at the same time still need the image tagged with latest. At present need to do two runs of imgpkg push with the same input.

          imgpkg push --file . \
            --image ghcr.io/${REPOSITORY}:sha-${REPOSITORY_SHA7} \
            --registry-username=${{github.actor}} \
            --registry-password=${{secrets.GITHUB_TOKEN}}
          imgpkg push --file . \
            --image ghcr.io/${REPOSITORY}:latest \
            --registry-username=${{github.actor}} \
            --registry-password=${{secrets.GITHUB_TOKEN}}

Running imgpkg push twice is inconvenient.

Describe the solution you'd like

Add an --additional-tag option for allowing one or more (list option more than once) tags to the image in addition to the primary tag in the image reference given to --image option.

Anything else you would like to add:

Since imgpkg push already adds a sha256-???.imgpkg tag in addition to the user tag, the mechanics should exist already to do this, so shouldn't be a huge problem.

The name for the option of --additional-tag is inspired by option of same name in skopeo used to add extra tags when copying images.

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