fix indentation for in-toto and traces

exporter/local/fs.go

@@ -132,7 +132,7 @@ func CreateFS(ctx context.Context, sessionID string, k string, ref cache.Immutab
 
 		names := map[string]struct{}{}
 		for i, stmt := range stmts {
-			dt, err := json.Marshal(stmt)
+			dt, err := json.MarshalIndent(stmt, "", "  ")
 			if err != nil {
 				return nil, nil, errors.Wrap(err, "failed to marshal attestation")
 			}

solver/llbsolver/provenance.go

@@ -188,7 +188,7 @@ type resultRequests struct {
 	platforms []exptypes.Platform
 }
 
-// filterImagePlatforms filter out images that not for the current platform if an image existist for every platform in a result
+// filterImagePlatforms filter out images that not for the current platform if an image exists for every platform in a result
 func (reqs *resultRequests) filterImagePlatforms(k string, imgs []provenance.ImageSource) []provenance.ImageSource {
 	if len(reqs.platforms) == 0 {
 		return imgs

solver/llbsolver/solver.go

@@ -353,6 +353,7 @@ func (s *Solver) recordBuildHistory(ctx context.Context, id string, req frontend
 					return err
 				}
 				enc := json.NewEncoder(w)
+				enc.SetIndent("", "  ")
 				for _, sp := range spans {
 					if err := enc.Encode(sp); err != nil {
 						return err