Add retry mechanism to docker_image resource

[xerikssonx]

I’ve run into an issue when using the docker_image resource. Sometimes, when pulling an image, the Docker registry or network may have a temporary problem and the request fails. In such cases, docker_image immediately fails without retrying.

It would be very useful if the docker_image resource supported a built-in retry mechanism (with configurable retry count and delay), similar to how other Terraform providers handle transient errors.

Would it be possible to add retry support to this resource?