Fixes bug for retrieving images with tags containing image digests.
Script now gets images from jobs and cronjobs as well.
New env variable DESTINATION_REGISTRY to push to another registry
instead of local registry.
New env variable IMAGES_FROM_FILE to pull images listed in a file
instead of getting images from a running k8s environment.
New env variable REGISTRY_PORT to override port (default is 5000).
Previously IDs of container images were gotten from tar files of container
images but that way was wrong. If multiple json files are contained in a
tar file, the script got multiple IDs and tried to pass these IDs on
`docker tag` command. Then the command was failed.
This updates the script to get image IDs from `docker image inspect` command
to fix this issue.
In addition, this adds a check a registry container exists already or not
before deploying registry container to avoid a container conflict failure.
When running the script, I faced the following error but it was
difficult to know the root problem due to lack of error handling.
docker tag" requires exactly 2 arguments.
See 'docker tag --help'.
Usage: docker tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]
Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE
To investigate such errors easily, this adds an error handling.