message: script: Make LXC container size suitable for gitian builds
  This change prevents "No space left on device" error.
diff: @@ -39,7 +39,7 @@ def setup():
  if args.docker:
  make_image_prog += ['--docker']
  elif not args.kvm:
  - make_image_prog += ['--lxc']
  + make_image_prog += ['--lxc', '--disksize', '13000']
  subprocess.check_call(make_image_prog)
  os.chdir(workdir)
  if args.is_focal and not args.kvm and not args.docker:
  