Which type of Gerrit events should trigger the build.
- Patch set created Trigger when a new change or patch set is uploaded (default)
- Draft published Trigger when a draft change or patch set is published (default, if available in Gerrit version)
- Change abandoned Trigger when a change is abandoned
- Change merged Trigger when a change is merged/submitted
- Change restored Trigger when a change is restored
- Comment added Trigger when a review comment is left with the indicated vote category and value
- Reference updated Trigger when a reference (e.g., branch or tag) is updated