DPE-7726: Avoid unnecessary Patroni reloads

The list of IPs were randomly sorted causing unnecessary Partroni
configuration re-generation with following Patroni restart/reload.

Author: taurus-forever

src/cluster.py

@@ -744,7 +744,7 @@ def render_patroni_yml_file(
             partner_addrs=self.charm.async_replication.get_partner_addresses()
             if not no_peers
             else [],
-            peers_ips=self.peers_ips if not no_peers else set(),
+            peers_ips=sorted(self.peers_ips) if not no_peers else set(),
             pgbackrest_configuration_file=PGBACKREST_CONFIGURATION_FILE,
             scope=self.cluster_name,
             self_ip=self.unit_ip,

src/relations/async_replication.py

@@ -265,8 +265,9 @@ def get_partner_addresses(self) -> list[str]:
             or self.charm.unit_peer_data.get("unit-promoted-cluster-counter")
             == self._get_highest_promoted_cluster_counter_value()
         ) and (peer_members := self.charm._peer_members_ips):
-            logger.debug(f"Partner addresses: {peer_members}")
-            return list(peer_members)
+            sorted_partners = sorted(peer_members)
+            logger.debug(f"Partner addresses: {sorted_partners}")
+            return list(sorted_partners)
 
         logger.debug("Partner addresses: []")
         return []