code: def run(self, concurrency=0, outline=False,
              tail=False, dump=False, *args, **kwargs):
          
          plan = self._generate_plan(tail=tail)
          if not plan.keys():
              logger.warn('WARNING: No stacks detected (error in config?)')
          if not outline and not dump:
              plan.outline(logging.DEBUG)
              logger.debug("Launching stacks: %s", ", ".join(plan.keys()))
              walker = build_walker(concurrency)
              plan.execute(walker)
          else:
              if outline:
                  plan.outline()
              if dump:
                  plan.dump(directory=dump, context=self.context,
                            provider=self.provider)
docs: Kicks off the build/update of the stacks in the stack_definitions.
  
          This is the main entry point for the Builder.