To start with, you don't even need to hook it up. Just commit the image-versions.yml file to the repo, add the Renovate config and make sure it bumps the versions as you'd expect
Once this works, we would just need to add logic to the workflow to extract the registry, tag and digest from the YAML, and use it in the Containerfile's FROM line Or I think there's a CLI argument in podman buildpodman build to build from a specific base image