Add config of `trackingId`

[tomitamasa]

I have tried specifying a trackingId in YAML.

We have a problem when trying to use the -prune option in our project. Our project has multiple YAML files for the same environment, and when we execute a command with the -prune option, settings from the last apply YAML file overwrite the others.

Related Issue: https://github.com/Songmu/ecschedule/issues/92

A trackingId is explicitly specified in a configuration file.

region: ap-northeast-1
cluster: staging
role: ecsTaskExecutionRole
trackingId: test-tag
rules:
...

The EventBridge console

When a trackingId is not specified, the default value is set to the cluster name (ex.staging). The EventBridge console

this closes https://github.com/Songmu/ecschedule/issues/92

[tomitamasa]

@Songmu Thanks for the nice tool.

Could you please review this Pull Request? I apologize for the request I made during ISUCON last week.

[Songmu]

Thanks for the pull request! I see. I understood that it is a need to attach a specific identifier to a job, especially for deletion. Sorry for the delay in responding, let me give it some thought, including whether naming it trackingID is appropriate.

[tomitamasa]

Thank you for your response!

Applying multiple configuration files at different timings might be less common, but it would be appreciated if you could consider this possibility.