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  Specifies when to trigger a downstream build for matrix jobs:
  <ul>
  	<li>ONLY_PARENT: trigger only once when parent finishes</li>
  	<li>ONLY_CONFIGURATIONS: trigger for each configuration</li>
  	<li>BOTH: combination of the 2 above options</li>
  </ul>
	
	Note: that downstream jobs will only be triggered, if they are not already in the build queue.
	So, if all your configurations finish within a short timeframe, only one downstream job
	might be triggered, even if you have selected ONLY_CONFIGURATIONS or BOTH.
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