allow task role name

Author: dupontz

ecs-task.cfndsl.rb

@@ -15,6 +15,9 @@
 
     log_retention = external_parameters.fetch(:log_retention, 7)
     log_group_name = external_parameters.fetch(:log_group_name, Ref('AWS::StackName'))
+
+    task_role_name = external_parameters.fetch(:task_role_name, nil)
+
     Logs_LogGroup('LogGroup') {
       LogGroupName log_group_name
       RetentionInDays log_retention
@@ -286,6 +289,7 @@
         AssumeRolePolicyDocument service_assume_role_policy(['ecs-tasks','ssm'])
         Path '/'
         Policies(iam_role_policies(iam_policies))
+        RoleName task_role_name unless task_role_name.nil?
       end
 
       IAM_Role('ExecutionRole') do