Add ssl certs to cloudsql instance (#1049)

* add ssl certs to cloudsql instance

* rename variable

* fix typo

Co-authored-by: Ludovico Magnocavallo <ludomagno@google.com>

modules/cloudsql-instance/main.tf

@@ -175,3 +175,10 @@ resource "google_sql_user" "users" {
   host     = each.value.host
   password = each.value.password
 }
+
+resource "google_sql_ssl_cert" "postgres_client_certificates" {
+  for_each    = var.postgres_client_certificates != null ? toset(var.postgres_client_certificates) : toset([])
+  provider    = google-beta
+  instance    = google_sql_database_instance.primary.name
+  common_name = each.key
+}