add: ECS example template (#3915)

* add: ECS example template

* fix: empty main.tf

* cleanup

* rm: cluster & compute

* set CPU & memory vars

Co-authored-by: Ben Potter <ben@coder.com>

Co-authored-by: Ben Potter <ben@coder.com>

examples/templates/ecs-container/README.md

@@ -0,0 +1,23 @@
+---
+name: Develop in an ECS-hosted container
+description: Get started with Linux development on AWS ECS.
+tags: [cloud, aws]
+---
+
+# aws-ecs
+
+This is a sample template for running a Coder workspace on ECS. It assumes there
+is a pre-existing ECS cluster with EC2-based compute to host the workspace.
+
+## Architecture
+
+This workspace is built using the following AWS resources:
+
+- Task definition - the container definition, includes the image, command, volume(s)
+- ECS service - manages the task definition
+
+## code-server
+
+`code-server` is installed via the `startup_script` argument in the `coder_agent`
+resource block. The `coder_app` resource is defined to access `code-server` through
+the dashboard UI over `localhost:13337`.

examples/templates/ecs-container/main.tf

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+terraform {
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 4.28"
+    }
+    coder = {
+      source  = "coder/coder"
+      version = "~> 0.4.9"
+    }
+  }
+}
+
+variable "ecs-cluster" {
+  description = "Input the ECS cluster ARN to host the workspace"
+  default     = ""
+}
+variable "cpu" {
+  default = "1024"
+}
+
+variable "memory" {
+  default = "2048"
+}
+
+# configure AWS provider with creds present on Coder server host
+provider "aws" {
+  shared_config_files      = ["$HOME/.aws/config"]
+  shared_credentials_files = ["$HOME/.aws/credentials"]
+}
+
+# coder workspace, created as an ECS task definition
+resource "aws_ecs_task_definition" "workspace" {
+  family = "coder"
+
+  requires_compatibilities = ["EC2"]
+  cpu                      = var.cpu
+  memory                   = var.memory
+  container_definitions = jsonencode([
+    {
+      name      = "coder-workspace-${data.coder_workspace.me.id}"
+      image     = "codercom/enterprise-base:ubuntu"
+      cpu       = 1024
+      memory    = 2048
+      essential = true
+      user      = "coder"
+      command   = ["sh", "-c", coder_agent.coder.init_script]
+      environment = [
+        {
+          "name"  = "CODER_AGENT_TOKEN"
+          "value" = coder_agent.coder.token
+        }
+      ]
+      mountPoints = [
+        {
+          # the name of the volume to mount
+          sourceVolume = "home-dir-${data.coder_workspace.me.id}"
+          # path on the container to mount the volume at
+          containerPath = "/home/coder"
+        }
+      ]
+      portMappings = [
+        {
+          containerPort = 80
+          hostPort      = 80
+        }
+      ]
+    }
+  ])
+
+  # workspace persistent volume definition
+  volume {
+    name = "home-dir-${data.coder_workspace.me.id}"
+
+    docker_volume_configuration {
+      # "shared" ensures that the disk is persisted upon workspace restart
+      scope         = "shared"
+      autoprovision = true
+      driver        = "local"
+    }
+  }
+}
+
+resource "aws_ecs_service" "workspace" {
+  name            = "workspace-${data.coder_workspace.me.id}"
+  cluster         = var.ecs-cluster
+  task_definition = aws_ecs_task_definition.workspace.arn
+  # scale the service to zero when the workspace is stopped
+  desired_count = data.coder_workspace.me.start_count
+}
+
+data "coder_workspace" "me" {}
+
+resource "coder_agent" "coder" {
+  arch           = "amd64"
+  auth           = "token"
+  os             = "linux"
+  dir            = "/home/coder"
+  startup_script = <<EOT
+    #!/bin/bash
+    # install and start code-server
+    curl -fsSL https://code-server.dev/install.sh | sh  | tee code-server-install.log
+    code-server --auth none --port 13337 | tee code-server-install.log &
+  EOT
+}
+
+resource "coder_app" "code-server" {
+  agent_id      = coder_agent.coder.id
+  name          = "code-server"
+  icon          = "/icon/code.svg"
+  url           = "http://localhost:13337?folder=/home/coder"
+  relative_path = true
+}