code: def _generate_iam_invoke_role_policy(self):
          
          invoke_pol = {
              "Version": "2012-10-17",
              "Statement": [
                  {
                      "Effect": "Allow",
                      "Resource": ["*"],
                      "Action": ["lambda:InvokeFunction"]
                  }
              ]
          }
          self.tf_conf['resource']['aws_iam_role_policy']['invoke_policy'] = {
              'name': self.resource_name + '-invoke',
              'role': '${aws_iam_role.invoke_role.id}',
              'policy': json.dumps(invoke_pol)
          }
docs: Generate the policy for the IAM role used by API Gateway to invoke
          the lambda function.
  
          Terraform name: aws_iam_role.invoke_role