With the workflow plugin, after you've performed a SCM step (e.g. with "git" or "checkout"), is there an easy way to get information about the revision that was just checked out? Specifically, I'm doing a checkout from Git, and I need to know what the commit hash is that the job pulled. In a normal job, this would be injected as the GIT_COMMIT environment variable, but in the workflow script that doesn't appear to be available.