Add workflow execution process

internal/workflow/node-processor/start_node.go

@@ -0,0 +1,29 @@
+package nodeprocessor
+
+import (
+	"context"
+
+	"github.com/usual2970/certimate/internal/domain"
+	"github.com/usual2970/certimate/internal/utils/xtime"
+)
+
+type startNode struct {
+	node *domain.WorkflowNode
+	*Logger
+}
+
+func NewStartNode(node *domain.WorkflowNode) *startNode {
+	return &startNode{
+		node:   node,
+		Logger: NewLogger(node),
+	}
+}
+
+// 开始节点没有任何操作
+func (s *startNode) Run(ctx context.Context) error {
+	s.AddOutput(ctx, xtime.BeijingTimeStr(),
+		s.node.Name,
+		"完成",
+	)
+	return nil
+}