Adds fix to update Services if loadbalancer-extra-annotations config option is set (#451)

## Issue

[450](#450)
Configuring `loadbalancer-extra-annotations` doesn't update the
Kubernetes Service

## Solution

Updates the check for recreating the LoadBalancer service to verify if
the current annotations match the value set inside
`loadbalancer-extra-annotations` config option. If they don't match, it
will update the service inside K8s

Author: fabi200123

src/charm.py

@@ -184,16 +184,22 @@ def _reconcile_service(self) -> None:
         service = self._get_service()
         service_exists = service is not None
         service_type = service_exists and _ServiceType(service.spec.type)
-        if service_exists and service_type == desired_service_type:
-            return
-
-        pod0 = self._get_pod(f"{self.app.name}/0")
-
+        service_annotations = {}
+        if service_exists:
+            service_annotations = service.metadata.annotations or {}
         annotations = (
             json.loads(self.config.get("loadbalancer-extra-annotations", "{}"))
             if desired_service_type == _ServiceType.LOAD_BALANCER
             else {}
         )
+        if (
+            service_exists
+            and service_type == desired_service_type
+            and service_annotations == annotations
+        ):
+            return
+
+        pod0 = self._get_pod(f"{self.app.name}/0")
 
         desired_service = lightkube.resources.core_v1.Service(
             metadata=lightkube.models.meta_v1.ObjectMeta(