style: fix golangci-lint errors

internal/executors/sandbox/executor.go

@@ -43,9 +43,12 @@ func (e *Sandbox) Run(cmd stage.Cmd) (*stage.Result, error) {
 func (e *Sandbox) Cleanup() error {
 	slog.Info("sandbox cleanup")
 	for _, fileID := range e.cachedMap {
-		e.execClient.FileDelete(context.TODO(), &pb.FileID{
+		_, err := e.execClient.FileDelete(context.TODO(), &pb.FileID{
 			FileID: fileID,
 		})
+		if err != nil {
+			slog.Error("sandbox cleanup", "error", err)
+		}
 	}
 	return nil
 }

internal/stage/model.go

@@ -115,7 +115,6 @@ type Result struct {
 	FileIDs    map[string]string `json:"fileIds,omitempty"`
 	FileError  []FileError       `json:"fileError,omitempty"`
 
-	files []string
 	Buffs map[string][]byte `json:"-"`
 }
 

internal/stage/run.go

@@ -55,6 +55,9 @@ func Run(stages []Stage) []StageResult {
 
 func Cleanup() {
 	for _, executor := range executorMap {
-		executor.Cleanup()
+		err := executor.Cleanup()
+		if err != nil {
+			slog.Error("executor cleanup error", "error", err)
+		}
 	}
 }