environment: Scale prod worker to 4

Change-Id: I602bca86132648aacb132c962bf2db1d0bbddff3
Reviewed-on: https://go-review.googlesource.com/c/pkgsite-metrics/+/702119
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ethan Lee <ethanalee@google.com>
Reviewed-by: Markus Kusano <kusano@google.com>

terraform/environment/worker.tf

diff --git a/terraform/environment/worker.tf b/terraform/environment/worker.tf
index a534ddd..0356d63 100644
--- a/terraform/environment/worker.tf
+++ b/terraform/environment/worker.tf
@@ -208,7 +208,7 @@
 # Other components.
 
 resource "google_cloud_tasks_queue" "worker_queues" {
-  count = var.env == "prod" ? 1 : 4
+  count = 4
   project  = var.project
   name     = "${var.env}-worker-queue-${count.index}"
   location = var.region