Flaky download of bunny128.bin

[hughperkins]

e.g.

[W 04/29/25 17:59:22.513 2602023] [misc.py:adaptive_arch_select@758] Arch=[<Arch.cuda: 3>] is not supported, falling back to CPU
[Taichi] Starting on arch=arm64
:: Downloading https://github.com/yuanming-hu/taichi_assets/releases/download/llvm8/bunny_128.bin
[E 250429 17:59:23 run:242] repos/difftaichi/examples/volume_renderer.py failed!
Traceback (most recent call last):
  File "/Users/bot/actions-runner/_work/taichi/taichi/taichi-release-tests/run.py", line 327, in <module>
    main()
  File "/Users/bot/actions-runner/_work/taichi/taichi/taichi-release-tests/run.py", line 323, in main
    run_timelines(options.timelines)
  File "/Users/bot/actions-runner/_work/taichi/taichi/taichi-release-tests/run.py", line 312, in run_timelines
    run(test)
  File "/Users/bot/actions-runner/_work/taichi/taichi/taichi-release-tests/run.py", line 233, in run
    spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 850, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/Users/bot/actions-runner/_work/taichi/taichi/taichi-release-tests/repos/difftaichi/examples/volume_renderer.py", line 226, in <module>
    main()
  File "/Users/bot/actions-runner/_work/taichi/taichi/taichi-release-tests/repos/difftaichi/examples/volume_renderer.py", line 186, in main
    urllib.request.urlretrieve(url, 'bunny_128.bin', reporthook=report)
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 239, in urlretrieve
    with contextlib.closing(urlopen(url, data)) as fp:
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 214, in urlopen
    return opener.open(url, data, timeout)
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 523, in open
    response = meth(req, response)
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 632, in http_response
    response = self.parent.error(
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 555, in error
    result = self._call_chain(*args)
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 494, in _call_chain
    result = func(*args)
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 747, in http_error_302
    return self.parent.open(new, timeout=req.timeout)
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 523, in open
    response = meth(req, response)
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 632, in http_response
    response = self.parent.error(
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 561, in error
    return self._call_chain(*args)
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 494, in _call_chain
    result = func(*args)
  File "/Users/bot/.cache/ti-build-cache/mambaforge/envs/3.9/lib/python3.9/urllib/request.py", line 641, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 618: jwt:jwt-not-provided
+ unset-git-caching-proxy

e.g. see

https://github.com/taichi-dev/taichi/actions/runs/14728221911/job/41335943125?pr=8697