pkg/egressgateway: ensure gateway IP is IPv4

If the agent assigns a IPv6 IP as the gateway IP packets will be dropped
because the egress gateway feature doesn't support a IPv6 underlay. This
commit ensures the IP chosen as the gateway IP is IPv4.

Fixes: cilium#39985

Signed-off-by: Robin Gögge <r.goegge@isovalent.com>

Author: rgo3

pkg/egressgateway/policy.go

@@ -129,7 +129,7 @@ func (config *PolicyConfig) regenerateGatewayConfig(manager *Manager) {
 				continue
 			}
 
-			addr, ok := netipx.FromStdIP(node.GetK8sNodeIP())
+			addr, ok := netipx.FromStdIP(node.GetNodeIP(false))
 			if !ok {
 				continue
 			}