feat(agentapi): add enable_tasks variable to conditionally create coder_ai_task resource

This allows users to disable AI task creation when using the agentapi module
with count = 0, avoiding the validation requirement for 'AI Prompt' parameter.

When enable_tasks = false, the coder_ai_task resource will not be created,
allowing the module to be used without defining the required AI Prompt parameter.

registry/coder/modules/agentapi/README.md

@@ -28,6 +28,7 @@ module "agentapi" {
   cli_app_display_name = "Goose CLI"
   module_dir_name      = local.module_dir_name
   install_agentapi     = var.install_agentapi
+  enable_tasks         = var.enable_tasks  # Set to false to disable AI tasks
   pre_install_script   = var.pre_install_script
   post_install_script  = var.post_install_script
   start_script         = local.start_script

registry/coder/modules/agentapi/main.tf

@@ -156,6 +156,11 @@ variable "module_dir_name" {
   description = "Name of the subdirectory in the home directory for module files."
 }
 
+variable "enable_tasks" {
+  type        = bool
+  description = "Whether to enable AI tasks. When false, the coder_ai_task resource will not be created, avoiding the requirement for an 'AI Prompt' parameter."
+  default     = true
+}
 
 locals {
   # we always trim the slash for consistency
@@ -240,7 +245,9 @@ resource "coder_app" "agentapi_cli" {
 }
 
 resource "coder_ai_task" "agentapi" {
+  count = var.enable_tasks ? 1 : 0
+  
   sidebar_app {
     id = coder_app.agentapi_web.id
   }
-}
+}