Clean 'scan cache clean' code and add timeout to it

internal/vulnerability/runner.go

@@ -19,7 +19,6 @@ package vulnerability
 
 import (
 	"context"
-	"errors"
 	"time"
 
 	"github.com/aquasecurity/trivy/pkg/commands/artifact"
@@ -86,12 +85,12 @@ func clearTrivyCache(ctx context.Context, log *logp.Logger) error {
 	log.Info("Starting VulnerabilityRunner.ClearCache")
 	defer log.Info("Ending VulnerabilityRunner.ClearCache")
 
-	err := clean.Run(ctx, flag.Options{CleanOptions: flag.CleanOptions{CleanScanCache: true}})
-	if err != nil {
-		if !errors.Is(err, artifact.SkipScan) {
-			return err
-		}
-	}
-
-	return nil
+	return clean.Run(ctx, flag.Options{
+		CleanOptions: flag.CleanOptions{
+			CleanScanCache: true,
+		},
+		GlobalOptions: flag.GlobalOptions{
+			Timeout: 5 * time.Second,
+		},
+	})
 }