Add listeners to stop crawlers in dev envs

cdk/lib/app-stack.ts

@@ -157,18 +157,29 @@ export class AppStack extends cdk.Stack {
 
     if (!production) {
       fargateService.listener.addAction("ListenerRule", {
-        priority: 10,
+        priority: 1,
         conditions: [elbv2.ListenerCondition.pathPatterns(["/robots.txt"])],
         action: elbv2.ListenerAction.fixedResponse(200, {
           contentType: "text/plain",
           messageBody: `User-agent: *
                         Disallow: /`.replace(/  +/g, ""),
         }),
       });
+
+      fargateService.listener.addAction("ListenerRule", {
+        priority: 2,
+        conditions: [elbv2.ListenerCondition.pathPatterns(["/sitemap.xml"])],
+        action: elbv2.ListenerAction.fixedResponse(404, {
+          contentType: "text/plain",
+          messageBody:
+            "404 Not Found: The requested URL /sitemap.xml was not found on this server.",
+        }),
+      });
     }
 
     fargateService.listener.addAction("HostListenerRule", {
-      priority: 1,
+      // priority updates if on dev enviornment to block crawlers
+      priority: !production ? 3 : 1,
       conditions: [elbv2.ListenerCondition.hostHeaders(["*.codu.co"])],
       action: elbv2.ListenerAction.forward([fargateService.targetGroup]),
     });