fix: implement http health-check responder for primary routing

litefs.yml

@@ -8,14 +8,14 @@ data:
 # Use Consul for leader election
 lease:
   type: "consul"
-  advertise-url: "http://${ADVERTISE_IP}:20202"
+  advertise-url: "http://${ADVERTISE_IP}:8081"
   consul:
     url: "${CONSUL_URL}"
     key: "litefs/navidrome"
 
 # Internal HTTP API for replication
 http:
-  addr: ":20202"
+  addr: "0.0.0.0:8081"
 
 # The HTTP Proxy routes traffic to handle write-forwarding
 # It listens on 8080 inside the container.
@@ -31,4 +31,9 @@ proxy:
     - "*.jpg"
     - "*.jpeg"
     - "*.gif"
-    - "*.svg"
+    - "*.svg"
+
+# Commands to run only on the primary node. 
+# This serves as a primary-only health check responder.
+exec:
+  - cmd: "while true; do echo -e 'HTTP/1.1 200 OK\r\nContent-Length: 7\r\n\r\nPrimary' | nc -l -p 8082; done"