Merge pull request #205 from LeoMcA/discourse-caching-5xx

don't cache 502-4 codes on discourse cdn

modules/discourse/main.tf

@@ -83,6 +83,18 @@ module "discourse-cdn" {
     {
       error_caching_min_ttl = 0
       error_code = 404
+    },
+    {
+      error_caching_min_ttl = 0
+      error_code = 502
+    },
+    {
+      error_caching_min_ttl = 0
+      error_code = 503
+    },
+    {
+      error_caching_min_ttl = 0
+      error_code = 504
     }
   ]
 }