Defaulting Cosmos DB provisioning to false and added variable in tfvars

Signed-off-by: kkrishTa <Kamalakara_T@infosys.com>

cloud-service-provider/azure/aks/terraform/README.md

@@ -26,6 +26,10 @@ terraform init
 
 By default, 1-node cluster is created which is suitable for running the OPEA application. See `variables.tf` and `opea-<application-name>.tfvars` if you want to tune the cluster properties, e.g., number of nodes, instance types or disk size.
 
+## Cosmos DB
+
+By default Cosmos DB will not be provisioned. If you want Cosmos DB as part of your resource provisioning, update `is_cosmosdb_required` property present in `opea-<application-name>.tfvars` to `true`.
+
 ## Persistent Volume Claim
 
 OPEA needs a volume where to store the model. For that we need to create Kubernetes Persistent Volume Claim (PVC). OPEA requires `ReadWriteMany` option since multiple pods needs access to the storage and they can be on different nodes. On AKS, only Azure File Service supports `ReadWriteMany`. Thus, each OPEA application below uses the file `aks-azfs-csi-pvc.yaml` to create PVC in its namespace.
@@ -36,7 +40,6 @@ OPEA needs a volume where to store the model. For that we need to create Kuberne
 
 Use the commands below to create AKS cluster.
 User has to input their Azure subscription id while running the following commands when prompted.
-User should also input their decision to install Cosmos DB as part of the installation when prompted.
 
 ```bash
 terraform plan --var-file opea-chatqna.tfvars -out opea-chatqna.plan

cloud-service-provider/azure/aks/terraform/opea-chatqna.tfvars

@@ -4,3 +4,4 @@ node_pool_type = "Spot" # cheaper
 os_disk_size_gb = 50
 location = "eastus"
 kubernetes_version = "1.30"
+is_cosmosdb_required = false

cloud-service-provider/azure/aks/terraform/variables.tf

@@ -105,4 +105,5 @@ variable "throughput" {
 variable "is_cosmosdb_required" {
   type    = bool
   description = "Is Cosmos DB required for your deployment? [true/false]"
+  default     = false
 }