feat: support optional CAS in AWS (PSCLOUD-365)

examples/sample-input-optionalcas.tfvars

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+# !NOTE! - These are only a subset of the variables in CONFIG-VARS.md provided
+# as examples. Customize this file to add any variables from CONFIG-VARS.md whose
+# default values you want to change.
+
+# ****************  REQUIRED VARIABLES  ****************
+# These required variables' values MUST be provided by the User
+prefix   = "<prefix-value>"
+location = "<aws-location-value>" # e.g., "us-east-1"
+# ****************  REQUIRED VARIABLES  ****************
+
+# !NOTE! - Without specifying your CIDR block access rules, ingress traffic
+#          to your cluster will be blocked by default.
+
+# **************  RECOMMENDED  VARIABLES  ***************
+default_public_access_cidrs = [] # e.g., ["123.45.6.89/32"]
+ssh_public_key              = "~/.ssh/id_rsa.pub"
+# **************  RECOMMENDED  VARIABLES  ***************
+
+# Tags for all tagable items in your cluster.
+tags = {} # e.g., { "key1" = "value1", "key2" = "value2" }
+
+# Postgres config - By having this entry a database server is created. If you do not
+#                   need an external database server remove the 'postgres_servers'
+#                   block below.
+postgres_servers = {
+  default = {},
+}
+
+## Cluster config
+kubernetes_version           = "1.32"
+default_nodepool_node_count  = 2
+default_nodepool_vm_type     = "r6in.2xlarge"
+default_nodepool_custom_data = ""
+
+## General
+efs_performance_mode = "maxIO"
+storage_type         = "standard"
+
+# ****************  OPTIONAL CAS CONFIGURATION  ****************
+# This configuration is optimized for SAS Viya Programming-only deployments.
+# 
+# Keep the cas block commented out to avoid CAS node pool creation:
+#    - No CAS node pool or EC2 instances created
+#    - Zero cost for CAS infrastructure
+# ******************************************************************
+
+## Cluster Node Pools config
+node_pools = {
+#  cas = {
+#    "vm_type"      = "r6idn.2xlarge"
+#    "cpu_type"     = "AL2023_x86_64_STANDARD"
+#    "os_disk_type" = "gp2"
+#    "os_disk_size" = 200
+#    "os_disk_iops" = 0
+#    "min_nodes"    = 0
+#    "max_nodes"    = 5
+#    "node_taints"  = ["workload.sas.com/class=cas:NoSchedule"]
+#    "node_labels" = {
+#      "workload.sas.com/class" = "cas"
+#    }
+#    "custom_data"                          = ""
+#    "metadata_http_endpoint"               = "enabled"
+#    "metadata_http_tokens"                 = "required"
+#    "metadata_http_put_response_hop_limit" = 1
+#  },
+  compute = {
+    "vm_type"      = "m6idn.xlarge"
+    "cpu_type"     = "AL2023_x86_64_STANDARD"
+    "os_disk_type" = "gp2"
+    "os_disk_size" = 200
+    "os_disk_iops" = 0
+    "min_nodes"    = 1
+    "max_nodes"    = 5
+    "node_taints"  = ["workload.sas.com/class=compute:NoSchedule"]
+    "node_labels" = {
+      "workload.sas.com/class"        = "compute"
+      "launcher.sas.com/prepullImage" = "sas-programming-environment"
+    }
+    "custom_data"                          = ""
+    "metadata_http_endpoint"               = "enabled"
+    "metadata_http_tokens"                 = "required"
+    "metadata_http_put_response_hop_limit" = 1
+  },
+  stateless = {
+    "vm_type"      = "m6in.xlarge"
+    "cpu_type"     = "AL2023_x86_64_STANDARD"
+    "os_disk_type" = "gp2"
+    "os_disk_size" = 200
+    "os_disk_iops" = 0
+    "min_nodes"    = 1
+    "max_nodes"    = 5
+    "node_taints"  = ["workload.sas.com/class=stateless:NoSchedule"]
+    "node_labels" = {
+      "workload.sas.com/class" = "stateless"
+    }
+    "custom_data"                          = ""
+    "metadata_http_endpoint"               = "enabled"
+    "metadata_http_tokens"                 = "required"
+    "metadata_http_put_response_hop_limit" = 1
+  },
+  stateful = {
+    "vm_type"      = "m6in.xlarge"
+    "cpu_type"     = "AL2023_x86_64_STANDARD"
+    "os_disk_type" = "gp2"
+    "os_disk_size" = 200
+    "os_disk_iops" = 0
+    "min_nodes"    = 1
+    "max_nodes"    = 3
+    "node_taints"  = ["workload.sas.com/class=stateful:NoSchedule"]
+    "node_labels" = {
+      "workload.sas.com/class" = "stateful"
+    }
+    "custom_data"                          = ""
+    "metadata_http_endpoint"               = "enabled"
+    "metadata_http_tokens"                 = "required"
+    "metadata_http_put_response_hop_limit" = 1
+  }
+}
+
+
+# Jump Server
+create_jump_vm = true
+jump_vm_admin  = "jumpuser"
+jump_vm_type   = "t3.medium"
+
+# NFS Server
+# required ONLY when storage_type is "standard" to create NFS Server VM
+create_nfs_public_ip = false
+nfs_vm_admin         = "nfsuser"
+nfs_vm_type          = "m6in.xlarge"
+
+# NOTE: For multi-zone deployments, keep the CAS configuration changes above
+#       and refer to sample-input-multizone.tfvars for additional zone settings