Feature Request: append certs to local images

[Conor-Behard333]

Hi,
Would it be possible to use incert on images locally.

For instance, I have images built using Apko and want to load them locally with docker load < image.tar then append my organisations certs into the container and then upload them to our container registry. Currently the process is having to push the newly built image then pull it down again with incert, add the certs, and reupload it.