fix: add deploymentConfig dependency within DepeloymentGroup and update readme

Author: kimisme9386

packages/cdk-blue-green-container-deployment/README.md

@@ -152,11 +152,9 @@ export class BlueGreenContainerDeploymentStack extends Stack {
       prodTrafficListener: prodListener,
       testTrafficListener: testListener,
       terminationWaitTimeInMinutes: 100,
-      deploymentConfig,
+      deploymentConfig, // If you want to use default DeploymentConfig name, use static method which like "EcsDeploymentConfig.CANARY_10PERCENT_15MINUTES".
     });
 
-    deploymentGroup.node.addDependency(deploymentConfig);
-
     // @see https://github.com/cloudcomponents/cdk-constructs/tree/master/examples/blue-green-container-deployment-example/blue-green-repository
     const repository = new Repository(this, 'CodeRepository', {
       repositoryName: 'blue-green-repository',

packages/cdk-blue-green-container-deployment/src/ecs-deployment-group.ts

@@ -124,6 +124,10 @@ export class EcsDeploymentGroup extends Resource implements IEcsDeploymentGroup
 
     this.deploymentConfig = deploymentConfig || EcsDeploymentConfig.ALL_AT_ONCE;
 
+    if (Construct.isConstruct(props.deploymentConfig)) {
+      this.node.addDependency(props.deploymentConfig);
+    }
+
     const ecsDeploymentGroup = new CustomResource(this, 'CustomResource', {
       serviceToken,
       resourceType: 'Custom::EcsDeploymentGroup',