Support for `docker image import`

[andrewbaxter]

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Description

Being able to import images from the output of a "docker export". I have a build process that results in a docker export tarball and there's no simple way to import it at the moment.

New or Affected Resource(s)

• docker_image Rather than add it into docker_image it might be cleaner to make a new docker_import_image resource.

Potential Terraform Configuration

References

The oci/skopeo libraries have methods for copying images to and from a number of formats which would make this fairly simple... but it'd be another dependency and I see there are already docker imports. I don't know if a similar method is exposed in the docker libraries.