Trying a find command to get the first non-null Digest

.github/workflows/go.yml

@@ -39,9 +39,10 @@ jobs:
         with:
           version: latest
           args: release --clean
+        id: goreleaser
       - name: generate build provenance
         uses: github-early-access/generate-build-provenance@main
         with:
           subject-name: ghcr.io/openchami/ochami-init
-          subject-digest: ${{ steps.push.outputs.digest }}
+          subject-digest: ${{ fromJson(steps.goreleaser.outputs.artifacts).find(artifact => artifact.extra.Digest != null).extra.Digest }}          
           push-to-registry: true