metrics/kustomize: update Kustomize examples

docs/examples/kustomize/base/configmap.yaml

@@ -5,4 +5,5 @@ metadata:
 data:
   server_url: $(PUBLIC_PROTO)://$(PUBLIC_HOSTNAME)
   listen_addr: "0.0.0.0:8080"
+  metrics_listen_addr: "127.0.0.1:8081"
   ephemeral_node_inactivity_timeout: "30m"

docs/examples/kustomize/postgres/deployment.yaml

@@ -25,6 +25,11 @@ spec:
                 configMapKeyRef:
                   name: headscale-config
                   key: listen_addr
+            - name: METRICS_LISTEN_ADDR
+              valueFrom:
+                configMapKeyRef:
+                  name: headscale-config
+                  key: metrics_listen_addr
             - name: DERP_MAP_PATH
               value: /vol/config/derp.yaml
             - name: EPHEMERAL_NODE_INACTIVITY_TIMEOUT

docs/examples/kustomize/sqlite/statefulset.yaml

@@ -26,6 +26,11 @@ spec:
                 configMapKeyRef:
                   name: headscale-config
                   key: listen_addr
+            - name: METRICS_LISTEN_ADDR
+              valueFrom:
+                configMapKeyRef:
+                  name: headscale-config
+                  key: metrics_listen_addr
             - name: DERP_MAP_PATH
               value: /vol/config/derp.yaml
             - name: EPHEMERAL_NODE_INACTIVITY_TIMEOUT