At the moment, we have little to no information to go off, when pruning "unused" images.
Keep additional metadata about the Images (e.g. "when was the image last used to create an instance", "is the image being used by any running isntance", ...), so we can prune smartly.
Metadata Update from @jskladan: - Custom field story_points adjusted to 2 - Issue priority set to: Low
Metadata Update from @jskladan: - Issue assigned to jskladan