Trigger Lambda role policy for InvokeFunction and EC2:Describe*

trigger_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Stmt1447799371000",
            "Effect": "Allow",
            "Action": [
                "ec2:Describe*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Sid": "Stmt1447799537000",
            "Effect": "Allow",
            "Action": [
                "lambda:InvokeFunction"
            ],
            "Resource": [
                "arn:aws:lambda:us-east-1:<aws-account-number>:function:worker_function"
            ]
        }
    ]
}