docs: def clean_builds(self, _args):
          """Delete all build caches for each recipe, python-install, java code
          and compiled libs collection.
  
          This does *not* delete the package download cache or the final
          distributions.  You can also use clean_recipe_build to delete the build
          of a specific recipe.
          """
          ctx = self.ctx
          if exists(ctx.build_dir):
              shutil.rmtree(ctx.build_dir)
          if exists(ctx.python_installs_dir):
              shutil.rmtree(ctx.python_installs_dir)
          libs_dir = join(self.ctx.build_dir, 'libs_collections')
          if exists(libs_dir):
              shutil.rmtree(libs_dir)