Doorbell button activates camera
<!-- FEATURE REQUESTS THAT ARE NOT FILLED OUT COMPLETELY WILL BE CLOSED AUTOMATICALLY WITHOUT WARNING AND WILL NOT RECEIVE A RESPONSE. THE FORM IS HERE FOR A REASON. :). -->
<!-- Please ensure you read the documentation before creating a feature request to ensure the functionality doesn't already exist. -->

**Is your feature request related to a problem? Please describe:** 
<Would be great if the doorbell trigger could be used to activate the camera live stream. the standard unify activation is slow to respond  -->

**Describe the solution you'd like:**
<!-- using the doorbell trigger to be able to run an automation to show door cam live view-->

**Describe alternatives you've considered:**
<!-- I tried using homebridge dummy switches. -->

**Additional context:**
<!-- Add any other context or screenshots about the feature request here. -->

<!-- Click the "Preview" tab before you submit to ensure the formatting is correct. -->
