Feature request: Set webhook to deploy stage on Github release (tag)

[junosuarez]

My use case: I currently have my project deploying to a master stage on any green push to the master branch using TravisCI webhooks.

I want to be able to deploy to a staging integration stage on every new GitHub release (new git tag).

Github will let you filter by event when setting up the webhook from the repo:

Samson should allow me to filter to specific events to trigger specific stages.