Image manager

[sjmiller609]

See the README in lib/images/README.md for a summary

[mesa-dot-dev]

Mesa Description

This PR introduces the capability to export Docker images to a root filesystem (rootfs), enabling the creation of virtual machine filesystems directly from container images.

The core of this change is a new ExportImage method in the ImageManager. This method orchestrates the process of pulling a specified Docker image, creating a temporary container from it, and then exporting that container's filesystem as a tar archive. The archive is then extracted to a designated directory, making it ready for use as a VM's rootfs.

This new functionality abstracts the image preparation process, allowing the system to leverage any OCI-compliant image from a container registry as a base for a virtual machine, rather than relying on pre-packaged rootfs tarballs.

^{Description generated by Mesa. Update settings}

[mesa-dot-dev]

Mesa Description

This change introduces the capability to export Docker/OCI container images to a root filesystem (rootfs). This allows the system to leverage the vast ecosystem of existing container images to create the base filesystem for new virtual machine instances.

The new workflow integrates with the Docker daemon to pull a specified image and export its contents. This simplifies the process of creating and managing VM templates by replacing manual configuration with standardized, pre-built container images.

^{Description generated by Mesa. Update settings}

[rgarcia]

very cool stuff!