[Feature] Set ttlSecondsAfterFinished in argo workflow with PipelineConf

[eterna2]

Background

Workflow resources are not removed after kf runs. Some of my runs involves hundreds of pods, which can result in a slow-down in the UI if there are not GC.

I know there is #844. So I am wondering what are the current workarounds? Currently, I am just running a cron job to remove resources > X days from creations.

So I am wondering if it is better to allow the sdk to set the ttlSecondsAfterFinished for the pipeline?

PR

This PR adds a new method set_ttl_seconds_after_finished to PipelineConf whereby the compiler will insert a new field ttlSecondsAfterFinished to the workflow spec if ttl_seconds_after_finished >= 0.

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This change is 

[k8s-ci-robot]

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[Ark-kun]

/lgtm
/approve

[k8s-ci-robot]

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[Ark-kun]

/lgtm

[Ark-kun]

/hold
@gaoning777 WDYT?

[gaoning777]

/lgtm

[gaoning777]

/hold cancel