use different host sizes for test and prod envs

Signed-off-by: Jakub Sokołowski <jakub@status.im>

host.tf

@@ -8,7 +8,7 @@ module "main" {
   host_count = 1
   env        = "referral"
   group      = "referral"
-  size       = "s-4vcpu-8gb"
+  size       = local.ws["host_size"]
   domain     = var.domain
 
   open_tcp_ports = ["80", "443"]

main.tf

@@ -42,3 +42,9 @@ locals {
       zone.name => zone.id
   }
 }
+
+/* WORKSPACES -----------------------------------*/
+
+locals {
+  ws = merge(local.env["defaults"], local.env[terraform.workspace])
+}

workspaces.tf

@@ -0,0 +1,24 @@
+/* WORKSPACES ---------------------------------------------*/
+
+/**
+ * This is a hacky way of binding specific variable
+ * values to different Terraform workspaces.
+ *
+ * Details:
+ * https://github.com/hashicorp/terraform/issues/15966
+ */
+
+locals {
+  env = {
+    defaults = {
+      host_size = "s-1vcpu-2gb"
+    }
+
+    test = {}
+    prod = {
+      host_size = "s-4vcpu-8gb"
+    }
+  }
+}
+
+/*---------------------------------------------------------*/