adding output for signatures (#83)

Author: MadsRC

.goreleaser.yaml

@@ -84,14 +84,15 @@ docker_signs:
   - cmd: "cosign"
     args:
       - "sign"
-      - "ghcr.io/madsrc/sophrosyne@${digest}"
+      - "${artifact}"
       - "--yes"
     artifacts: all
 
 signs:
   - cmd: "cosign"
     args:
       - "sign-blob"
+      - "--output-signature=${signature}"
       - "${artifact}"
       - "--yes"
     artifacts: all