prow/config/jobs.go
func (cm RegexpChangeMatcher) RunsAgainstChanges(changes []string) bool {
	for _, change := range changes {
		if cm.reChanges.MatchString(change) {
			return true
		}
	}
	return false
}
func (cm RegexpChangeMatcher) RunsAgainstChanges(changes []string) bool {
	for _, change := range changes {
		if cm.reChanges.MatchString(change) {
			return true
		}
	}
	return false
}
// RunsAgainstChanges returns true if any of the changed input paths match the run_if_changed regex.