feat: added optional cas support for sas programming only deployments in gcp (PSCLOUD-366)

examples/sample-input-optionalcas.tfvars

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+# !NOTE! - These are only a subset of CONFIG-VARS.md provided for sample.
+# Customize this file to add any variables from 'CONFIG-VARS.md' that you want 
+# to change their default values.
+
+# ****************  REQUIRED VARIABLES  ****************
+# These required variables' values MUST be provided by the User
+prefix                  = "<prefix-value>"
+location                = "<gcp-zone-or-region>" # e.g., "us-east1-b"
+project                 = "<gcp-project-id>"
+service_account_keyfile = "<service-account-json-file>"
+#
+# ****************  REQUIRED VARIABLES  ****************
+
+# ****************  RECOMMENDED VARIABLES  ****************
+default_public_access_cidrs = [] # e.g., ["123.45.6.89/32"]
+ssh_public_key              = "~/.ssh/id_rsa.pub"
+# ****************  RECOMMENDED VARIABLES  ****************
+
+# add labels to the created resources
+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 = {},
+},
+
+# GKE config
+kubernetes_version         = "1.32"
+default_nodepool_min_nodes = 2
+default_nodepool_vm_type   = "n2-highmem-8"
+
+# Node Pools config
+# ****************  OPTIONAL CAS CONFIGURATION  ****************
+# This configuration is optimized for SAS Viya Programming-only deployments.
+# 
+# Two options for making CAS optional:
+# 1. Keep the cas block commented out (no CAS node pool created)
+#    - No CAS node pool created
+#    - CAS cannot be deployed without infrastructure changes
+#
+# ******************************************************************
+node_pools = {
+#  cas = {
+#    "vm_type"      = "n2-highmem-16"
+#    "os_disk_size" = 200
+#    "min_nodes"    = 1
+#    "max_nodes"    = 1
+#    "node_taints"  = ["workload.sas.com/class=cas:NoSchedule"]
+#    "node_labels" = {
+#      "workload.sas.com/class" = "cas"
+#    }
+#    "local_ssd_count"   = 2
+#    "accelerator_count" = 0
+#    "accelerator_type"  = ""
+#  },
+  compute = {
+    "vm_type"      = "n2-highmem-4"
+    "os_disk_size" = 200
+    "min_nodes"    = 1
+    "max_nodes"    = 1
+    "node_taints"  = ["workload.sas.com/class=compute:NoSchedule"]
+    "node_labels" = {
+      "workload.sas.com/class"        = "compute"
+      "launcher.sas.com/prepullImage" = "sas-programming-environment"
+    }
+    "local_ssd_count"   = 1
+    "accelerator_count" = 0
+    "accelerator_type"  = ""
+  },
+  stateless = {
+    "vm_type"      = "n2-highmem-4"
+    "os_disk_size" = 200
+    "min_nodes"    = 1
+    "max_nodes"    = 4
+    "node_taints"  = ["workload.sas.com/class=stateless:NoSchedule"]
+    "node_labels" = {
+      "workload.sas.com/class" = "stateless"
+    }
+    "local_ssd_count"   = 0
+    "accelerator_count" = 0
+    "accelerator_type"  = ""
+  },
+  stateful = {
+    "vm_type"      = "n2-highmem-4"
+    "os_disk_size" = 200
+    "min_nodes"    = 1
+    "max_nodes"    = 2
+    "node_taints"  = ["workload.sas.com/class=stateful:NoSchedule"]
+    "node_labels" = {
+      "workload.sas.com/class" = "stateful"
+    }
+    "local_ssd_count"   = 0
+    "accelerator_count" = 0
+    "accelerator_type"  = ""
+  }
+}
+
+# Jump Box
+create_jump_public_ip = true
+jump_vm_admin         = "jumpuser"
+
+# Storage for SAS Viya CAS/Compute
+storage_type = "standard"
+# required ONLY when storage_type is "standard" to create NFS Server VM
+create_nfs_public_ip = false
+nfs_vm_admin         = "nfsuser"
+nfs_raid_disk_size   = 1000