Use this to save and load images from local disk. It is faster and more efficient than network loading. Caveat, the images can become outdated.
docker pull gradle:4.7.0-jdk8
docker save gradle:4.7.0-jdk8 | gzip -c > gradle_470jdk8.dockerimage.tgz
zcat gradle_470jdk8.dockerimage.tgz | docker load