This script will pull an image from the public docker registry and push it to your private registry

get-image.sh

#!/bin/bash

private_registry="registry.example.com:5000"

if [ -z "$1" ]; then
    echo "Usage: $0 <image_name>"
    exit 1
fi

image_name=$1

docker pull $image_name || (echo "Failed to pull image $image_name" && exit 1)
docker tag $image_name $private_registry/$image_name || (echo "Failed to tag image $image_name" && exit 1)

echo "Pushing image $image_name to $private_registry"
docker push $private_registry/$image_name || (echo "Failed to push image $image_name" && exit 1)

echo -e "\n\nYour image is now available at $private_registry/$image_name"