feat: add allow mounting of service account token

[afreyermuth98]

What issues does your PR fix?

Impossible to mount the service account token

What does your PR do?

This PR adds support to allow the service account token to be mounted. It's needed when you use IAM Role to connect to AWS for example using a service account

Checklist

For all Pull Requests

• [X] Commits are signed off
• [X] Commits have semantic messages
• [X] Documentation updated
• [X] Passes ct linting

For releasing ONLY

• [ ] Chart.yaml version bumped
• [ ] CHANGELOG.md updated