Enhancement: support instanceName filtering for kubernetes deployment (#2488)

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Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

docs/configs/kubernetes.md

@@ -79,6 +79,7 @@ metadata:
     gethomepage.dev/widget.url: "https://emby.example.com"
     gethomepage.dev/pod-selector: ""
     gethomepage.dev/weight: 10 # optional
+    gethomepage.dev/instance: "public" # optional
 spec:
   rules:
     - host: emby.example.com
@@ -95,6 +96,8 @@ spec:
 
 When the Kubernetes cluster connection has been properly configured, this service will be automatically discovered and added to your Homepage. **You do not need to specify the `namespace` or `app` values, as they will be automatically inferred.**
 
+If you are using multiple instances of homepage, an `instance` annotation can be specified to limit services to a specific instance. If no instance is provided, the service will be visible on all instances.
+
 ### Traefik IngressRoute support
 
 Homepage can also read ingresses defined using the Traefik IngressRoute custom resource definition. Due to the complex nature of Traefik routing rules, it is required for the `gethomepage.dev/href` annotation to be set:
@@ -116,6 +119,7 @@ metadata:
     gethomepage.dev/widget.url: "https://emby.example.com"
     gethomepage.dev/pod-selector: ""
     gethomepage.dev/weight: 10 # optional
+    gethomepage.dev/instance: "public" # optional
 spec:
   entryPoints:
     - websecure