feat: add coder_task data source

[johnstcn]

Terraform will tolerate a certain amount of self-reference, but this changes when using count.

For example, the below is accepted

resource "coder_ai_task" "task" {
  app_id = module.agent.task_app_id
}

module "agent" {
  source = "..."
  prompt = coder_ai_task.task.prompt
}

Whereas this outputs a cycle error:

data "coder_workspace" "me" {}

resource "coder_ai_task" "task" {
  count = data.coder_workspace.me.start_count
  app_id = module.agent[count.index].task_app_id
}

module "agent" {
  count = data.coder_workspace.me.start_count
  source = "..."
  prompt = coder_ai_task.task[count.index].prompt
}

After some cursory searching, I didn't find much more information on this apart from this post.

Adding a data source is not too big a deal as the required environment variables are already present.

With this additional data source, the above example becomes:

data "coder_workspace" "me" {}
data "coder_task" "me" {}

resource "coder_ai_task" "task" {
  count = data.coder_workspace.me.start_count
  app_id = module.agent[count.index].task_app_id
}

module "agent" {
  count = data.coder_workspace.me.start_count
  source = "..."
  prompt = data.coder_task.me.prompt
}

NB: I explicitly named this coder_task to sidestep this check in Coder. I'm open to alternative names, but it can't be coder_ai_task.

See coder/coder#20416 for what this looks like in practice.

[johnstcn]

drive-by go fmt

[mafredri]

Small suggestions but otherwise 👍🏻

[mafredri]

Should we set optional true, is that possible for computed?

[johnstcn]

I don't think we should according to the documentation for Computed:

If Required and Optional are both false, the attribute will be considered "read only" for the practitioner, with only the provider able to set its value.

[mafredri]

Ah TIL, I had assumed computed already meant read-only.