docs: def jenkins_last_build_sha():
          """
          Returns the sha of the last completed jenkins build for this project.
          Expects JOB_URL in environment
          """
          job_url = os.getenv('JOB_URL')
          job_json_url = "{0}/api/json".format(job_url)
          response = urllib.urlopen(job_json_url)
          job_data = json.loads(response.read())
  
          last_completed_build_url = job_data['lastCompletedBuild']['url']
          last_complete_build_json_url = "{0}/api/json".format(last_completed_build_url)
  
          response = urllib.urlopen(last_complete_build_json_url)
          last_completed_build = json.loads(response.read())
  
          return last_completed_build[1]['lastBuiltRevision']['SHA1']