Support official atlantis version #42
Description
As mentioned in https://github.com/cloudposse/terraform-aws-ecs-atlantis#caveats, this module is geared towards a fork of atlantis. That fork seems no longer actively maintained. Further the feature added to this fork, namely the "ability to restrict plan and apply to GitHub teams", has recently been integrated into the official atlantis via runatlantis/atlantis#1694.
All in all we have a desire to use the official atlantis version. Using this Terraform module, we ran into a small issue with that: The parameter names for the GitHub team feature differ. In the forked version, it was gh-team-whitelist, in the official version, it became gh-team-allowlist (cf. https://www.runatlantis.io/docs/server-configuration.html#gh-team-allowlist).
As a consequence, the SSM parameter store entry name created in https://github.com/cloudposse/terraform-aws-ecs-atlantis/blob/0.24.1/main.tf#L232 does not match what the official atlantis ultimately needs as input.
I don't know whether the forked version still needs to be supported or not which would determine whether the existing parameter name could just be updated or whether it's safer to just write the setting to both the old and new name.