Firebase hosting provides the ability to deploy to preview channels, as opposed to the primary live hosting deployment.  It would be very useful to add this feature to the Firebase Deploy integration for Bitbucket Pipelines so we can do things like deploy preview channels for PRs or for staging/QA.

[[Firebase Preview Channel Docs||https://firebase.google.com/docs/hosting/test-preview-deploy?authuser=0#preview-channels] https://firebase.google.com/docs/hosting/test-preview-deploy?authuser=0#preview-channels [] |https://firebase.google.com/docs/hosting/test-preview-deploy?authuser=0#preview-channels]