app/aws/ec2 
region - string 
The region where the EC2 Instance resides.
instance_id - string 
The ID of the EC2 Instance.
Format: i-01234567890123456
adminer - object [Optional] 
An AWS IAM user and access keys with explicit access to start an SSH session. This is optional and enables nullstone ssh from the Nullstone CLI.
Format 
value = {
    name       = aws_iam_user.adminer.name
    access_key = aws_iam_access_key.adminer.id
    secret_key = aws_iam_access_key.adminer.secret
}Required IAM permissions 
[ec2-arn]
    ssm:StartSession
arn:aws:ssm:[region]::document/AWS-StartSSHSession
    ssm:StartSessionIAM permissions for Port Forwarding 
arn:aws:ssm:[region]::document/AWS-StartPortForwardingSession
    ssm:StartSession
arn:aws:ssm:[region]::document/AWS-StartPortForwardingSessionToRemoteHost
    ssm:StartSession