more (20? more exponentially grow) retries on 500s

[yarikoptic]

was getting logs for a new one -- dandi-archive , eventually crashed with

2022-05-11T18:29:52-0400 [INFO    ] tinuous Downloading logs for cli-integration.yml (Test Integration with dandi-cli) #1050 to 2022/02/10/github/push/master/081e828/Test Integration with dandi-cli/1050
2022-05-11T18:29:53-0400 [WARNING ] tinuous Request to https://api.github.com/repos/dandi/dandi-archive/actions/runs/1824934158/logs returned 500; waiting & retrying
2022-05-11T18:29:54-0400 [WARNING ] tinuous Request to https://api.github.com/repos/dandi/dandi-archive/actions/runs/1824934158/logs returned 500; waiting & retrying
2022-05-11T18:29:59-0400 [WARNING ] tinuous Request to https://api.github.com/repos/dandi/dandi-archive/actions/runs/1824934158/logs returned 500; waiting & retrying
2022-05-11T18:30:09-0400 [WARNING ] tinuous Request to https://api.github.com/repos/dandi/dandi-archive/actions/runs/1824934158/logs returned 500; waiting & retrying
2022-05-11T18:30:25-0400 [WARNING ] tinuous Request to https://api.github.com/repos/dandi/dandi-archive/actions/runs/1824934158/logs returned 500; waiting & retrying
2022-05-11T18:30:51-0400 [WARNING ] tinuous Request to https://api.github.com/repos/dandi/dandi-archive/actions/runs/1824934158/logs returned 500; waiting & retrying
2022-05-11T18:31:28-0400 [WARNING ] tinuous Request to https://api.github.com/repos/dandi/dandi-archive/actions/runs/1824934158/logs returned 500; waiting & retrying
2022-05-11T18:32:18-0400 [WARNING ] tinuous Request to https://api.github.com/repos/dandi/dandi-archive/actions/runs/1824934158/logs returned 500; waiting & retrying
2022-05-11T18:33:23-0400 [WARNING ] tinuous Request to https://api.github.com/repos/dandi/dandi-archive/actions/runs/1824934158/logs returned 500; waiting & retrying
2022-05-11T18:34:44-0400 [WARNING ] tinuous Request to https://api.github.com/repos/dandi/dandi-archive/actions/runs/1824934158/logs returned 500; waiting & retrying
Traceback (most recent call last):
  File "/mnt/backup/dandi/tinuous-logs/venv/bin/tinuous", line 10, in <module>
    sys.exit(main())
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/core.py", line 1128, in __call__
    return self.main(*args, **kwargs)
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/core.py", line 1053, in main
    rv = self.invoke(ctx)
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/core.py", line 1659, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/core.py", line 1395, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/core.py", line 754, in invoke
    return __callback(*args, **kwargs)
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/decorators.py", line 38, in new_func
    return f(get_current_context().obj, *args, **kwargs)
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/tinuous/__main__.py", line 127, in fetch
    paths = obj.download(Path(path))
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/tinuous/github.py", line 321, in download
    self.client.download_zipfile(self.logs_url, path)
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/tinuous/base.py", line 143, in download_zipfile
    self.download(path, zippath)
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/tinuous/base.py", line 115, in download
    r = self.get(path, stream=True)
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/tinuous/base.py", line 107, in get
    r.raise_for_status()
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/requests/models.py", line 960, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 500 Server Error: Internal Server Error for url: https://api.github.com/repos/dandi/dandi-archive/actions/runs/1824934158/logs

so it was just about 5 minutes of retries, and wait times between retries seems to not grow as much as it could.

IMHO should try for longer and with steeper growing sleeps