How can i deploy ember cli index to s3 without sha

i'm using ember-cli-deploy and ember-deploy-s3-index.

Following this article i managed to deploy the index to a bucket with static web hosting and another bucket holding the assets.

I want to automate (CI) the deploy process but there are two problems:

1. Each deploy adds an index file with a new name (test:b2907fa.html for example), and i need to manually change the index document to match the latest deploy in my s3 configuration.
2. I need to add permissions to the file on each deploy.

I would like to have a fixed name (override existing on deploy) for my index file, and that the file will have view permissions by default.

Is this possible? Thanks.