Merge branch 'fix-iam-binding-conflict' into 'master'

Fix flip-flop on iam bindings for roles/pubsub.publisher

See merge request !847

environments/gstg/main.tf

@@ -1953,5 +1953,6 @@ resource "google_project_iam_binding" "log-writer" {
 
   members = [
     "${google_logging_project_sink.pubsub.writer_identity}",
+    "serviceAccount:${var.service_account_email}",
   ]
 }