use variable for vultr plan

.github/workflows/arrow.yml

@@ -27,6 +27,16 @@ on:
           - create
           - destroy
           - nothing
+      plan:
+        type: choice
+        required: false
+        options:
+          - vc2-1c-1gb # 25 GB / $5
+          - vc2-1c-2gb # 55 GB / $10 (default)
+          - vc2-2c-2gb # 65 GB / $15
+          - vc2-2c-4gb # 80 GB / $20
+          - vc2-4c-8gb # 160 GB / $40
+          - vc2-6c-16gb # 320 GB / $80
 
 jobs:
   build-deploy:
@@ -92,6 +102,8 @@ jobs:
       - name: Terraform Apply
         if: inputs.action == 'create'
         working-directory: ${{ env.TERRAFORM_DIRECTORY }}
+        env:
+          TF_VAR_vultr_plan: ${{ inputs.plan }}
         run: |
           terraform apply \
             -auto-approve \

hosts/arrow/main.tf

@@ -45,6 +45,13 @@ variable "vultr_api_key" {
   sensitive   = true
 }
 
+# https://api.vultr.com/v2/plans
+variable "vultr_plan" {
+  type        = string
+  description = "Size of instance to launch"
+  default     = "vc2-1c-2gb" # 55 GB SSD ($10/mo)
+}
+
 provider "aws" {
   region                      = "auto"
   skip_credentials_validation = true
@@ -75,7 +82,7 @@ resource "vultr_iso_private" "image" {
 }
 
 resource "vultr_instance" "arrow" {
-  plan                = "vc2-1c-2gb"
+  plan                = var.vultr_plan
   region              = "ewr"
   iso_id              = vultr_iso_private.image.id
   label               = "arrow"