Migrate from Docker Hub to Github Container Registry

docker_migration.sh

#!/bin/bash
# Script to move an image from Docker Hub to Github container registry
original_image="ejabberd/ecs"
target_image="processone/ejabberd"
target_acr="ghcr.io"
# list of tag matches to ignore (i.e. "beta|rc")
grep_filter="<none>"

# Download all image tags
docker pull $original_image --all-tags

# For all tags for that image, tag them and push them to new registry
# (using tac to create the tags in chronological order)
docker images $original_image \
  --format "docker tag {{.Repository}}:{{.Tag}} $target_acr/$target_image:{{.Tag}} | docker push $target_acr/$target_image:{{.Tag}}" |
  grep -vE $grep_filter |
  tac |
  bash