GitHub Pull Request Trigger

The following fields are available on GitHub Pull Request events. See related documentation on getting started with GitHub and on event triggers.

Here are some of the most commonly used attributes.

attribute	description
`event.github.pull_request.number`	The pull request number
`event.github.pull_request.pull_request.head.ref`	The pull request branch
`event.github.pull_request.pull_request.head.sha`	The commit sha of the head of the pull request
`event.github.pull_request.pull_request.title`	The pull request title