stackhpc-multinode: add small_cluster option

to spawn a single controller and compute nodes.
To use when getting quota errors

Author: elelaysh

.github/workflows/stackhpc-multinode.yml

@@ -53,6 +53,10 @@ name: Multinode
         description: terraform-kayobe-multinode version
         type: string
         default: main
+      small_cluster:
+        description: Create cluster with only 1 controller, 1 compute
+        default: 'false'
+        type: boolean
 jobs:
   multinode:
     name: Multinode
@@ -72,4 +76,6 @@ jobs:
       # NOTE(upgrade): Reference the PREVIOUS and CURRENT releases here.
       stackhpc_kayobe_config_previous_version: ${{ inputs.upgrade == 'major' && 'stackhpc/2024.1' || 'stackhpc/2025.1' }}
       terraform_kayobe_multinode_version: ${{ inputs.terraform_kayobe_multinode_version }}
+      multinode_controller_count: ${{ inputs.small_cluster && 1 || 3 }}
+      multinode_compute_count: ${{ inputs.small_cluster && 1 || 3 }}
     secrets: inherit