feat: add enable_message_ordering attribute for push subscription (#195)

Author: dkuji

README.md

@@ -34,6 +34,7 @@ module "pubsub" {
       maximum_backoff            = "600s"                                               // optional
       minimum_backoff            = "300s"                                               // optional
       filter                     = "attributes.domain = \"com\""                        // optional
+      enable_message_ordering    = true                                                 // optional
     }
   ]
   pull_subscriptions = [

main.tf

@@ -194,6 +194,11 @@ resource "google_pubsub_subscription" "push_subscriptions" {
     "filter",
     null,
   )
+  enable_message_ordering = lookup(
+    each.value,
+    "enable_message_ordering",
+    null,
+  )
   dynamic "expiration_policy" {
     // check if the 'expiration_policy' key exists, if yes, return a list containing it.
     for_each = contains(keys(each.value), "expiration_policy") ? [each.value.expiration_policy] : []