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

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

vars/group_vars/kubernetes/services.yml

@@ -0,0 +1,5 @@
+services:
+  - name: argocd
+    ip: 192.168.20.240
+  - name: traefik
+    ip: 192.168.20.240

vars/group_vars/kubernetes/vars.yml

@@ -0,0 +1,15 @@
+domain: "{{ internal_domain }}"
+
+cert_resolver: "letsencrypt-prod"
+cert_manager_issuer_name: "{{ cert_resolver }}"
+cert_manager_email: "me+acme@tudattr.dev"
+
+traefik_cert_resolver: "{{ cert_resolver }}"
+traefik_dashboard_hostname: "traefik.k3s.{{ domain }}"
+
+argocd_cert_resolver: "{{ cert_resolver }}"
+argocd_hostname: "argocd.k3s.{{ domain }}"
+
+metallb_ip_range: "192.168.20.240-192.168.20.250"
+
+traefik_password: "{{ vault_kubernetes.traefik_password }}"