ContainerCmder creates a new exec.Cmder against a docker container.

CopyFrom copies the file or dir in the container at srcPath to the host at hostPath.

CopyTo copies the file at hostPath to the container at destPath.

PullIfNotPresent will pull an image if it is not present locally retrying up to retries times it returns true if it attempted to pull, and any errors from pulling.

Run creates a container with "docker run", with some error handling.

WithContainerArgs sets the args to the container as in the containerArgs portion of `docker run args..

WithRunArgs sets the args for docker run as in the args portion of `docker run args..

RunOpt is an option for Run.