Fix image cleanup to handle images with tag + digest #442
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We recently started pinning the Docker images via tag & sha in #375.
However, the cleanup process wasn't prepared for this and was no longer able to detect which image was the current one. It was expecting to match the current image name (image + tag + sha) with the list of digests returned by Docker (image + sha). That results in all the images being deleted on each run.
This process adjusts the cleanup process to extract an image name without the tag so we'll be able to match the current image against the
Docker.Imageinfo.RepoDigests
list.