feat: Added the ability to spin-up an abritrary number of runners at runtime

infra/modules/dev/main.tf

@@ -88,4 +88,19 @@ resource "hcloud_volume" "storage" {
   server_id = hcloud_server.this.id
   automount = true
   format    = "ext4"
+
+  lifecycle {
+    prevent_destroy = true
+  }
+}
+
+# Renders services/dev/Runners/docker-compose.yml directly into the repo, with
+# one runner service per var.runner_count. This only touches the local working
+# tree - deploying the change still goes through the normal scp + spinup.sh flow.
+resource "local_file" "runners_compose" {
+  filename = "${path.root}/../services/dev/Runners/docker-compose.yml"
+  content = templatefile("${path.module}/templates/runners-docker-compose.yml.tftpl", {
+    runner_count = var.runner_count
+  })
+  file_permission = "0644"
 }