fix: prevent panic on health check if a member has no IPs

If a member has no IP addresses, prevent cluster health checks from failing with a panic by checking for the length of member IPs and not assuming there's always at least 1 IP.

Signed-off-by: Utku Ozdemir <utku.ozdemir@siderolabs.com>

pkg/cluster/check/discovery.go

@@ -5,6 +5,7 @@
 package check
 
 import (
+	"fmt"
 	"net/netip"
 
 	"github.com/talos-systems/talos/pkg/cluster"
@@ -72,6 +73,10 @@ func memberToNodeInfo(member *clussterres.Member) (cluster.NodeInfo, error) {
 		return cluster.NodeInfo{}, err
 	}
 
+	if len(ips) == 0 {
+		return cluster.NodeInfo{}, fmt.Errorf("no IP address found for member: %s", member.Metadata().ID())
+	}
+
 	return cluster.NodeInfo{
 		InternalIP: ips[0],
 		IPs:        ips,