test bridges every hour

We want to use bridgestrap results to know if a bridge is running, instead of using the 'Running' flag (tpo/network-health/team#318). For that bridgstrap will need to update it's collector file every hour, currently bridgestrap tests bridges every 18h and publishes the collector file every day.

Is bridgestrap able to test all bridges every hour? Or do we need to consider other options (tpo/core/arti#717)?