fix: update artifact attestation in CI workflow 📝

- Change push-to-registry to false in `ghcr.yml`

Author: mingcheng

.github/workflows/ghcr.yml

@@ -48,9 +48,9 @@ jobs:
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.short-sha.outputs.sha }}
           labels: ${{ steps.meta.outputs.labels }}
-      # - name: Generate artifact attestation
-      #   uses: actions/attest-build-provenance@v2
-      #   with:
-      #     subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-      #     subject-digest: ${{ steps.push.outputs.digest }}
-      #     push-to-registry: true
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v2
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: false