lua-cluster-specifier: Fix upstream flakiness (#297)

Signed-off-by: Ryan Northey <[email protected]>

Author: phlax

lua-cluster-specifier/envoy.yaml

@@ -41,6 +41,34 @@ static_resources:
             typed_config:
               "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
 
+  - address:
+      socket_address:
+        address: 0.0.0.0
+        port_value: 10001
+    filter_chains:
+    - filters:
+      - name: envoy.filters.network.http_connection_manager
+        typed_config:
+          "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
+          stat_prefix: example_cluster_upstream
+          route_config:
+            name: local_route
+            virtual_hosts:
+            - name: upstream
+              domains:
+              - "*"
+              routes:
+              - match:
+                  prefix: "/"
+                direct_response:
+                  status: 200
+                  body:
+                    inline_string: "Helo!\n"
+          http_filters:
+          - name: envoy.filters.http.router
+            typed_config:
+              "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
+
   clusters:
   - name: example_cluster
     type: STRICT_DNS
@@ -52,5 +80,5 @@ static_resources:
         - endpoint:
             address:
               socket_address:
-                address: httpbin.org
-                port_value: 80
+                address: 127.0.0.1
+                port_value: 10001