Define dependencies between jobs

[bmuschko]

Often times I run into situations where I need to define two or more jobs that depend on each other. It would be great if you could define dependencies between them. Some situations I could think of are:

• Only trigger job two if job one was triggered and has finished.
• If job one is done commence running job two.
• If job one failed don't run job two at all.

For that we could define a new closure. Something like this:

static dependencies = {
    onSuccess {
        trigger class: MyTriggerClass, invoke: true
    }

    onFailure {
        log.error "Failed to run job."    
    }
}