fix docker release

Author: pierre-b

.github/workflows/docker-release.yml

@@ -56,7 +56,7 @@ jobs:
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1
         with:
-          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@${{ steps.meta.outputs.digest }}
+          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           subject-digest: ${{ steps.meta.outputs.digest }}
           push-to-registry: true