Update release.yml

Author: scottschreckengaust

.github/workflows/release.yml

@@ -54,6 +54,6 @@ jobs:
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1
         with:
-          subject-name: ${{ env.REGISTRY || "ghcr.io" }}/${{ env.IMAGE_NAME || github.repository}}
+          subject-name: ghcr.io/${{ github.repository}}
           subject-digest: ${{ steps.push.outputs.digest }}
           push-to-registry: true