feat: add k8s subcommand (#2065)

Co-authored-by: knqyf263 <knqyf263@gmail.com>

pkg/commands/option/kubernetes.go

@@ -0,0 +1,17 @@
+package option
+
+import (
+	"github.com/urfave/cli/v2"
+)
+
+// KubernetesOption holds the options for Kubernetes scanning
+type KubernetesOption struct {
+	Namespace string
+}
+
+// NewKubernetesOption is the factory method to return Kubernetes options
+func NewKubernetesOption(c *cli.Context) KubernetesOption {
+	return KubernetesOption{
+		Namespace: c.String("namespace"),
+	}
+}