Enable role to have system:masters access

I'm upgrading GH Actions workflow to use a role instead of a user following that secure strategy: https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/configuring-openid-connect-in-amazon-web-services

The problem is: EKS Auth Sync doesn't add roles based on tags (the same way it does it users) so I'm not able to allow my workflows to do changes inside the cluster.