Trap for Docker images with encoded characters in their names.

[alastairhm]

We have found there to be a few Docker images in our registry with encoded characters in their names, like '/' encoded as "%2F".
This is causing issues when trying to do the API curls resulting in 404 errors.
It would be good if there was an option to skip these images without failing the migration.

[mbentley]

Does the option for ERROR_ACTION=skip achieve what you're looking for? That should skip over the image when pushing or pulling or retagging.