IAM policy instruction Bug fix

[lhgomes]

Description

IAM policy instruction is asking for s3:HeadBucket permission that doesn't exists. It need to be changed to s3:ListBucket

Motivation

Help others to setup this task correctly

Testing

No test is required

Checklist

• [x] I have read the README document
• [X] I have read the CONTRIBUTING document
• [X] My code follows the code style of this project
• [X] I have added tests to cover my changes
• [X] A short description of the change has been added to the changelog using the script npm run newChange

License

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.