the pact url should be a url of a pact to verify, not the endpoint of the latests pacts for a consumer/provider, that will be terribly undeterministic.
there should be two types of provider build, one that runs everytime a provider build runs, and verifies any pacts via consumer version selectors.
the uri source is for webhooks, where a single pact requiring verification triggers a provider verification task to verify that specific pact