Fix privileged operation: Downloading custom binaries

[jonathanmetzman]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/mnt/scratch0/clusterfuzz/src/python/bot/startup/run_bot.py", line 128, in task_loop
    sys.exit(utasks.uworker_bot_main())
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/utasks/__init__.py", line 220, in uworker_bot_main
    uworker_main(input_download_url)
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/utasks/__init__.py", line 202, in uworker_main
    uworker_output = utask_module.utask_main(uworker_input)
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/utasks/variant_task.py", line 112, in utask_main
    build_manager.setup_build()
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/build_management/build_manager.py", line 1465, in setup_build
    return setup_custom_binary(target_weights=target_weights)
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/build_management/build_manager.py", line 1426, in setup_custom_binary
    job = data_types.Job.query(data_types.Job.name == job_name).get()
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/query.py", line 1229, in wrapper
    return wrapped(self, *dummy_args, _options=query_options)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/utils.py", line 78, in wrapper
    return wrapped(*args, **new_kwargs)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/utils.py", line 110, in positional_wrapper
    return wrapped(*args, **kwds)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/query.py", line 2063, in get
    return self.get_async(_options=kwargs["_options"]).result()
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py", line 193, in result
    self.check_success()
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py", line 140, in check_success
    raise self._exception
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py", line 312, in _advance_tasklet
    self.generator.throw(type(error), error, traceback)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/query.py", line 2097, in get_async
    results = yield _datastore_query.fetch(options)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py", line 312, in _advance_tasklet
    self.generator.throw(type(error), error, traceback)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_datastore_query.py", line 108, in fetch
    while (yield results.has_next_async()):
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py", line 312, in _advance_tasklet
    self.generator.throw(type(error), error, traceback)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_datastore_query.py", line 267, in has_next_async
    yield self._next_batch()  # First time
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py", line 312, in _advance_tasklet
    self.generator.throw(type(error), error, traceback)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_datastore_query.py", line 297, in _next_batch
    response = yield _datastore_run_query(query)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py", line 312, in _advance_tasklet
    self.generator.throw(type(error), error, traceback)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_datastore_query.py", line 878, in _datastore_run_query
    "RunQuery", request, timeout=query.timeout
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py", line 312, in _advance_tasklet
    self.generator.throw(type(error), error, traceback)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_retry.py", line 77, in retry_wrapper
    raise error
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_retry.py", line 72, in retry_wrapper
    result = yield result
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py", line 312, in _advance_tasklet
    self.generator.throw(type(error), error, traceback)
  File "/mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_datastore_api.py", line 97, in rpc_call
    raise error
google.api_core.exceptions.PermissionDenied: 403 Missing or insufficient permissions.