feat: Add Stable Diffusion inference image

[harubaru]

This adds the stable diffusion inference service which is depended upon by the Stable Diffusion finetuning workflow example.

[github-actions[bot]]

@harubaru Build complete, success: https://github.com/coreweave/ml-containers/actions/runs/3550561740 Image: ghcr.io/coreweave/ml-containers/sd-inference:amercurio-sd-finetuner-ee4cb3e

[github-actions[bot]]

@harubaru Build complete, success: https://github.com/coreweave/ml-containers/actions/runs/3550561742 Image: ghcr.io/coreweave/ml-containers/sd-finetuner:amercurio-sd-finetuner-ee4cb3e