Would it be possible to have S3-/GCS-/-AWS role based examples?

[brandontan-888]

Hi,

The examples assume only S3 and the need to use ACCESS_KEYs and SECRETs. Can we have 3 flavours of the Cloud examples using roles ( what are the least privileges required ?) and within each example, we should consider two scenarios:

1. Create a bucket and new output dir
2. Reuse an existing bucket and create new output dir

Thanks for your consideration.