Fargate scaling support

[villelahdenvuo]

Instance scheduler now supports ECS via ASG scaling, however it does not work for Fargate services as they do not use EC2/ASGs and have their own task scaling system.

Describe the feature you'd like

Add support for Fargate task scaling to instance scheduler, similar to how ASGs work.

Additional context

The workaround is to maintain your own scaling rules for Fargate services, but the idea of having a centralized instance scheduler is nice.

Example with CDK

```ts /** Set up office hours scaling to save money on development environments. */ private setupOfficeHours(scalableTarget: cdk.aws_ecs.ScalableTaskCount) { scalableTarget.scaleOnSchedule('OfficeHoursIn', { schedule: appscaling.Schedule.cron(OFFICE_HOURS.in), minCapacity: this.env.minCapacity ?? 1, maxCapacity: this.env.maxCapacity ?? 2, }); scalableTarget.scaleOnSchedule('OfficeHoursOut', { schedule: appscaling.Schedule.cron(OFFICE_HOURS.out), minCapacity: 0, maxCapacity: 0, }); } ```

[CrypticCabub]

Thanks for creating the feature request. If anybody else would like to see Fargate scheduling support prioritized, please upvote this issue.

[bientavu]

It is indeed a really cool feature to add! This instance scheduler project is perfect, only ECS Fargate scheduling is missing (and we use it a lot)