ECR への image push 成功後、自動的に ECS のサービスを update する Lambda 関数
https://docs.aws.amazon.com/ja_jp/AmazonCloudWatch/latest/events/EventTypes.html#ecr-event-types
https://docs.aws.amazon.com/ja_jp/AmazonECR/latest/userguide/ecr-eventbridge.html#ecr-eventbridge-bus
https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-ecs/index.html
https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-ecs/classes/updateservicecommand.html