roles.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Stmt1452746887373",
            "Action": [
                "ecs:RegisterTaskDefinition",
                "ecs:DeregisterTaskDefinition",
                "ecs:ListClusters",
                "ecs:DescribeContainerInstances",
                "ecs:ListTaskDefinitions",
                "ecs:DescribeTaskDefinition"
            ],
            "Effect": "Allow",
            "Resource": "*"
        },
        {
            "Sid": "Stmt1452746887374",
            "Action": [
                "ecs:StopTask",
                "ecs:ListContainerInstances"
            ],
            "Effect": "Allow",
            "Resource": "arn:aws:ecs:<region>:<accountId>:cluster/<clusterName>"
        },
        {
            "Sid": "Stmt1452746887375",
            "Action": [
                "ecs:RunTask"
            ],
            "Effect": "Allow",
            "Resource": "arn:aws:ecs:<region>:<accountId>:task-definition/jenkins-agent:*"
        },
        {
            "Sid": "Stmt1452746887376",
            "Action": [
                "ecs:StopTask",
		"ecs:DescribeTasks"
            ],
            "Effect": "Allow",
            "Resource": "arn:aws:ecs:<region>:<accountId>:task/*"
        }
    ]
}