This release adds a new input parameter, auto_merge, to the action. When set to "true", the action will attempt to auto-merge the default branch into the ref that the action is being ran on, as per the GitHub deployments documentation.
By default, auto_merge is set to false, which prevents GitHub attempting to auto-merge the default branch.
This should fix the intermittent deployment issues in #1 (thanks to @tiferrei for discovering the issue)