feat: Add support for cilium 1.15 and updated cilium to v1.15.4 (#11106)

roles/network_plugin/cilium/defaults/main.yml

@@ -7,6 +7,9 @@ cilium_mtu: ""
 cilium_enable_ipv4: true
 cilium_enable_ipv6: false
 
+# Enable l2 announcement from cilium to replace Metallb Ref: https://docs.cilium.io/en/v1.14/network/l2-announcements/
+cilium_l2announcements: false
+
 # Cilium agent health port
 cilium_agent_health_port: "{%- if cilium_version | regex_replace('v') is version('1.11.6', '>=') -%}9879{%- else -%}9876{%- endif -%}"
 
@@ -39,6 +42,10 @@ cilium_cpu_requests: 100m
 
 # Overlay Network Mode
 cilium_tunnel_mode: vxlan
+
+# LoadBalancer Mode (snat/dsr/hybrid) Ref: https://docs.cilium.io/en/stable/network/kubernetes/kubeproxy-free/#dsr-mode
+cilium_loadbalancer_mode: snat
+
 # Optional features
 cilium_enable_prometheus: false
 # Enable if you want to make use of hostPort mappings