Add R/O Onboarding example for AKS (#230)

* Add R/O Onboarding example for AKS

* remove unused variables

* run make generate-sdk

* update sdk

---------

Co-authored-by: Phil Andrews <[email protected]>
Co-authored-by: Phil Andrews <[email protected]>

examples/aks/aks_cluster_read_only/README.MD

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+# AKS and CAST AI example with CAST AI Autoscaler policies and additional Node Configurations
+Following example shows how to onboard AKS cluster to CAST AI, configure [Autoscaler policies](https://docs.cast.ai/reference/policiesapi_upsertclusterpolicies) and additional [Node Configurations](https://docs.cast.ai/docs/node-configuration/).
+
+Example configuration should be analysed in the following order:
+1. Create Virtual network - `vnet.tf`
+2. Create AKS cluster - `aks.tf`
+3. Create CAST AI related resources to connect AKS cluster to CAST AI, configure Autoscaler and Node Configurations - `castai.tf`
+
+# Usage
+1. Rename `tf.vars.example` to `tf.vars`
+2. Update `tf.vars` file with your cluster name, cluster region and CAST AI API token.
+3. Initialize Terraform. Under example root folder run:
+```
+terraform init
+```
+4. Run Terraform apply:
+```
+terraform apply -var-file=tf.vars
+```
+5. To destroy resources created by this example:
+```
+terraform destroy -var-file=tf.vars
+```

examples/aks/aks_cluster_read_only/aks.tf

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+data "azuread_client_config" "current" {}
+
+data "azurerm_subscription" "current" {}
+
+data "azurerm_kubernetes_cluster" "this" {
+  name                = var.cluster_name
+  resource_group_name = var.resource_group
+}
+

examples/aks/aks_cluster_read_only/castai.tf

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+# 3. Connect AKS cluster to CAST AI in READ-ONLY mode.
+
+# Configure Data sources and providers required for CAST AI connection.
+
+provider "castai" {
+  api_url   = var.castai_api_url
+  api_token = var.castai_api_token
+}
+
+provider "helm" {
+  kubernetes {
+    host                   = data.azurerm_kubernetes_cluster.this.kube_config.0.host
+    client_certificate      = base64decode(data.azurerm_kubernetes_cluster.this.kube_config.0.client_certificate)
+    client_key             = base64decode(data.azurerm_kubernetes_cluster.this.kube_config.0.client_key)
+    cluster_ca_certificate  = base64decode(data.azurerm_kubernetes_cluster.this.kube_config.0.cluster_ca_certificate)
+  }
+}
+
+resource "helm_release" "castai_agent" {
+  name             = "castai-agent"
+  repository       = "https://castai.github.io/helm-charts"
+  chart            = "castai-agent"
+  namespace        = "castai-agent"
+  create_namespace = true
+  cleanup_on_fail  = true
+
+  set {
+    name  = "provider"
+    value = "aks"
+  }
+  set_sensitive {
+    name  = "apiKey"
+    value = var.castai_api_token
+  }
+
+  # Required until https://github.com/castai/helm-charts/issues/135 is fixed.
+  set {
+    name  = "createNamespace"
+    value = "false"
+  }
+}
+

examples/aks/aks_cluster_read_only/providers.tf

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+# Following providers required by AKS and Vnet resources.
+provider "azurerm" {
+  features {}
+}
+
+provider "azuread" {
+  tenant_id = data.azurerm_subscription.current.tenant_id
+}

examples/aks/aks_cluster_read_only/tf.vars.example

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+cluster_name     = "EXAMPLE"
+cluster_region   = "EXAMPLE"
+castai_api_token = "EXAMPLE"
+resource_group    = "EXAMPLE_group"

examples/aks/aks_cluster_read_only/variables.tf

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+variable "cluster_name" {
+  type        = string
+  description = "Name of the AKS cluster to be connected to the CAST AI."
+}
+
+variable "cluster_region" {
+  type        = string
+  description = "Region of the cluster to be connected to CAST AI."
+}
+
+variable "resource_group" {
+  type        = string
+  description = "Azure resource group that contains the cluster."
+}
+
+variable "castai_api_url" {
+  type        = string
+  description = "CAST AI url to API, default value is https://api.cast.ai"
+  default     = "https://api.cast.ai"
+}
+
+variable "castai_api_token" {
+  type        = string
+  description = "CAST AI API token created in console.cast.ai API Access keys section."
+}

examples/aks/aks_cluster_read_only/versions.tf

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+terraform {
+  required_providers {
+    azurerm = {
+      source = "hashicorp/azurerm"
+    }
+    azuread = {
+      source = "hashicorp/azuread"
+    }
+    castai = {
+      source  = "castai/castai"
+    }
+  }
+  required_version = ">= 0.13"
+}