Add data ecs_runtask

[bertonha]

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Closes #1703

Release note for CHANGELOG:

data aws_ecs_run_task

start a task definition overriding it, useful for executing migrations

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

[bertonha]

Hello guys that is my first contribution in GO and to terraform.

The ideas of this PR is replace this:

locals {
  some_service_migration = {
    overrides = {
      containerOverrides = [
        {
          name    = var.service_name
          command = ["python", "manage.py", "migrate", "--noinput"]
        }
      ]
    }
    network_config = {
      awsvpcConfiguration: {
        assignPublicIp = "DISABLED"
        subnets        = aws_ecs_service.some_service.network_configuration[0].subnets
        securityGroups = aws_ecs_service.some_service.network_configuration[0].security_groups
      }
    }
  }
}

resource "null_resource" "call-sometask-migrate" {
  triggers = {
    task_definition = aws_ecs_service.sometask.task_definition
  }

  provisioner "local-exec" {
    interpreter = ["/bin/bash", "-c"]
    command = <<EOF
aws ecs run-task \
  --cluster ${aws_ecs_cluster.some.name} \
  --task-definition ${aws_ecs_task_definition.sometask.family}:${aws_ecs_task_definition.sometask.revision} \
  --launch-type FARGATE \
  --started-by "Terraform" \
  --overrides '${jsonencode(local.sometask_migration.overrides)}' \
  --network-configuration '${jsonencode(local.sometask_migration.network_config)}'
EOF

For a terraform resource:

data "aws_ecs_run_task" "call-sometask-migrate" {
    cluster         = aws_ecs_cluster.cluster.name
    task_definition = aws_ecs_task_definition.some_service.arn
    launch_type     = "FARGATE"
    started_by      = "Terraform"

    overrides {
        container_overrides {
            name    = var.service_name
            command = ["python", "manage.py", "migrate", "--noinput"]
        }
    }

    network_configuration {
        security_groups = aws_ecs_service.some_service.network_configuration[0].security_groups
        subnets         = aws_ecs_service.some_service.network_configuration[0].subnets
    }
}

I have 2 questions
1 - how I can test it?
2 - how I can make this data only be called when the parameters changes? maybe for this that needs to be a resource?

api docs
https://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_RunTask.html

[ewbankkit]

Closing as stale due to inactivity.

[Trip09]

great work @bertonha , it's a shame that there wasn't a review on this PR to allow merging the new resource @zhelding can you help? thanks

[aitorres]

+1. I think it would be really useful to re-open and consider this PR.

[mattheidelbaugh]

Would also really love to reopen this PR. Seems like a lot of people would fine this useful

[github-actions]

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