fix: websocket connections unreliable

Constant disconnection and reconnection every couple minutes or less.

go/k8s/dev/pusher.yaml

@@ -80,6 +80,24 @@ spec:
 
 ---
 
+# WebSocket connections need a much longer timeout than the default 30s.
+# Without this, GKE terminates idle WS connections after 30 seconds.
+apiVersion: networking.gke.io/v1
+kind: GCPBackendPolicy
+metadata:
+  name: pusher-backend-policy
+spec:
+  default:
+    timeoutSec: 60
+    connectionDraining:
+      drainingTimeoutSec: 30
+  targetRef:
+    group: ""
+    kind: Service
+    name: pusher
+
+---
+
 apiVersion: networking.gke.io/v1
 kind: HealthCheckPolicy
 metadata: