【feature request】ROLL provides Ascend Docker images

ROLL provides Ascend Docker images built on the CANN base image, enabling developers to develop models out of the box. It also integrates necessary toolchains for accuracy and performance, as well as the image OVERVIEW.md.
OS: Ubuntu
Expected Delivery Date: 2026/04/30

Start by locating the repository's current Docker image definitions and the image OVERVIEW.md, then review how they use the CANN base image and include the required toolchains. Done means an Ubuntu-compatible Ascend image is available for out-of-the-box model development and its OVERVIEW.md documents the image.

Written by the indexing model from the issue text.