service and web-service fail when using ECR

[idris]

If you try to setup a service or web-service using an image from ECR, Terraform fails with errors:

variable "main" is nil, but no error was reported

The reason is because the name is derived from image, replacing / with -. This works for names like segmentio/pingdummy, but when the image is hosted on ECS the image comes in the format aws_account_id.dkr.ecr.region.amazonaws.com/my-web-app. Those dots in the URL cause Terraform to fail.

Current workaround: Just specify a name when defining your service.