feat: add the OCI image source to ModelArtifact - #666

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/create-github-app-token@v2, actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

[prior-context] could not build prior review context ((t.comments || []).filter is not a function); review proceeds without it

No file matched to [/home/runner/work/gpustack-operator/gpustack-operator/**/*requirements*.txt,/home/runner/work/gpustack-operator/gpustack-operator/**/*requirements*.in,/home/runner/work/gpustack-operator/gpustack-operator/**/*constraints*.txt,/home/runner/work/gpustack-operator/gpustack-operator/**/*constraints*.in,/home/runner/work/gpustack-operator/gpustack-operator/**/pyproject.toml,/home/runner/work/gpustack-operator/gpustack-operator/**/uv.lock,/home/runner/work/gpustack-operator/gpustack-operator/**/*.py.lock]. The cache will never get invalidated. Make sure you have checked out the target repository and configured the cache-dependency-glob input correctly.

Empty workdir detected. This may cause unexpected behavior. You can enable ignore-empty-workdir to mute this warning.