* add `workflow_dispatch`
* Add an environment variable to indicate which repository the currently running Action came from.
* Expose the Action ref as well.
* Move setting `github.action_repository` and `github.action_ref` to `ActionRunner.cs`.
* Don't set `action_repository` and `action_ref` for local Actions.
Co-authored-by: Tingluo Huang <tingluohuang@github.com>
* Add environment variable for GITHUB_ACTION_PATH
* ah
* Remove debugging messages
* Set github action path at step level instead of global scope to avoid necessary removal
* Remove set context for github action
* Set github action path before and after composite action
* Copy GitHub Context, use this copied context for each composit step, and then set the action_path for each one (to avoid stamping over parent pointer GitHubContext
