David Pinfold

Add support for resolving parameters from AWS SSM credential manager

1

### Feature request > How can we improve the module? Add support for resolving parameters from AWS SSM credential manager. Would adding this line work? ``` Environment="CONCOURSE_AWS_SSM_REGION=${region}" ``` here: https://github.com/telia-oss/terraform-aws-concourse/blob/master/modules/cloud-init/atc.yml#L49