ci : add release attestation url (#27389)

.github/workflows/release.yml

@@ -1665,6 +1665,7 @@ jobs:
           tar -czvf release/llama-${{ steps.tag.outputs.name }}-ui.tar.gz --transform "s,^\.,llama-${{ steps.tag.outputs.name }}," -C ./ui-dist .
 
       - name: Attest release artifacts
+        id: attest
         uses: actions/attest@v4
         with:
           subject-path: 'release/*'
@@ -1696,6 +1697,9 @@ jobs:
             **Website:**
             - <https://llama.app>
 
+            **Attestations:**
+            - <${{ steps.attest.outputs.attestation-url }}>
+
             **macOS/iOS:**
             - [macOS Apple Silicon (arm64)](https://github.com/ggml-org/llama.cpp/releases/download/${{ steps.tag.outputs.name }}/llama-${{ steps.tag.outputs.name }}-bin-macos-arm64.tar.gz)
             - macOS Apple Silicon (arm64, KleidiAI enabled) [DISABLED](https://github.com/ggml-org/llama.cpp/pull/23780)