[FEAT] allow namespacing image with localhost/ to target local podman images

[benniekiss]

Description

Podman stores locally built images as localhost/${IMAGE}, so we should prepend localhost/ to the image name to ensure we target the correct image.

This PR makes sure to sanitize the destinationImage if it is namespaced with localhost/ so that it is pushed to the right location.

Currently, if images are namespaced as localhost/{IMAGE}, they are pushed either to registry/localhost/image, or registry/namespace/localhost/{IMAGE} if the registry is provided with a namespace.

Namespacing images as localhost/ also allows always targeting the podman image even if a docker image was built more recently as docker does not use localhost/ as a namespace. However, the PR currently sanitizes the image name so that it can be pulled from the docker daemon, but if this functionality is wanted, I can revert the changes on line 304 and line 307

Related Issue(s)

This may fix #66 by allowing a user to specifically target a local image

Checklist

• This PR includes a documentation change
• This PR does not need a documentation change

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• This PR includes test changes
• This PR's changes are already tested

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• This change is not user-facing
• This change is a patch change
• This change is a minor change
• This change is a major (breaking) change

Changes made

• allow namespacing images with localhost/ and sanitize the destination image