Runner Helper images should be used with the version tag rather than a commit sha
By default the helper images are used by the Kubernetes and Docker executors by their commit sha. This could be problematic in cases where a release has to be rebuilt from scratch by deleting the tag, adding new commits and recreating the tag. This can cause a mismatch for users who have downloaded a Runner from the tag before its deleted, such that the Runner could try to download images with non-existing tags.