Cloud Config: Make report bucket public.

I am following the documentation for setting up a cloud project, and there's step that mentions that you should make the report bucket public.

The first question is if that means that *anyone* can access the report bucket from their browser? If so, is it possible to add some ACL enforcement to make it so only allowed people can access the reports?

The second part of the issue is that even running that command does not seem to work:

```shell
gsutil iam ch allUsers:objectViewer gs://$REPORT_BUCKET_NAME
```

```
<{
"error": {
"code": 412,
"message": "One or more users named in the policy do not belong to a permitted customer.",
"errors": [
{
"message": "One or more users named in the policy do not belong to a permitted customer.",
"domain": "global",
"reason": "conditionNotMet",
"locationType": "header",
"location": "If-Match"
}
]
}
}
>
```

I am an owner on the gcp project, so I don't know what else needs to be done.