Support multiple users

[max-rocket-internet]

Currently this module adds multiple keys to a single user. I don't think it would be too hard to create a user for each key. What do you think? It would be a lot more usable.

[tmm]

For those still on the hunt, this module supports multiple users https://github.com/Guimove/terraform-aws-bastion

[max-rocket-internet]

This issue is not quite old but I also wrote one that doesn't need an S3 bucket, supports users and groups: https://github.com/deliveryhero/tf-ssh-bastion