Properly add ids for workflow execution and add first visualization

starter/example/workflow.go

@@ -8,7 +8,7 @@ import (
 	. "git.gorlug.de/code/ersteller/workflow"
 )
 
-func CreateExampleWorkflow(client *ent.Client) {
+func CreateExampleWorkflow(client *ent.Client) *Workflow {
 	lastStep := NewStep(&StepParams{
 		Name:        "Last step",
 		Identifier:  "last_step",
@@ -38,7 +38,8 @@ func CreateExampleWorkflow(client *ent.Client) {
 			}, lastStep, nil
 		},
 	})
-	NewWorkflow("Example", "example", firstStep)
+	w := NewWorkflow("Example", "example", firstStep, []*Step{firstStep, lastStep})
+	return w
 }
 
 //type name struct {