ci: sign metadata for Windows builds

[danieldk]

No description provided.

[danieldk]

/kernel-bot build-and-stage relu

[github-actions]

Build request processed.

Command: /kernel-bot build-and-stage relu
Mode: build and stage
Target branch: pr-984
PR head SHA: 9ab6bc858aad28a79f3a25a4cf745e046287790a
Workflows: build.yaml, build-mac.yaml, build-windows.yaml

Dispatched (3):

• relu (build-windows.yaml): https://github.com/huggingface/kernels-community/actions/runs/28008534205
• relu (build.yaml): https://github.com/huggingface/kernels-community/actions/runs/28008535567
• relu (build-mac.yaml): https://github.com/huggingface/kernels-community/actions/runs/28008536372