feat(kubernetes): add initial setup for ArgoCD, Cert-Manager, MetalLB, and Traefik

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

roles/reverse_proxy/tasks/50_netcup_dns.yml

@@ -1,9 +1,9 @@
 ---
 - name: Setup DNS on Netcup
   community.general.netcup_dns:
-    api_key: "{{ reverse_proxy_netcup_api_key }}"
-    api_password: "{{ reverse_proxy_netcup_api_password }}"
-    customer_id: "{{ reverse_proxy_netcup_customer_id }}"
+    api_key: "{{ netcup_api_key }}"
+    api_password: "{{ netcup_api_password }}"
+    customer_id: "{{ netcup_customer_id }}"
     domain: "{{ domain }}"
     name: "{{ service.name }}"
     type: "A"