ECS Fargate的quota限制
fargate有quota限制，默认新帐号下只能并发运行6个vcpu，如果遇到这个限制，会报错：
(service xxx) was unable to place a task. Reason: You've reached the limit on the number of tasks you can run concurrently. For more information, see the Troubleshooting section of the Amazon ECS Developer Guide.
需要提申请来扩大：
| Name | Default | Adjustable | Description |
|---|---|---|---|
| Fargate On-Demand vCPU resource count | Each supported Region: 6 | Yes | The number of Fargate vCPUs running concurrently as Fargate On-Demand in this account in the current Region. |
| Fargate Spot vCPU resource count | Each supported Region: 6 | Yes | The number of Fargate vCPUs running concurrently as Fargate Spot in this account in the current Region. |
