distributed secrets to group_vars and added karakeep

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

host_vars/k3s-postgres.yml

@@ -3,7 +3,7 @@ ansible_user: "{{ user }}"
 ansible_host: 192.168.20.23
 ansible_port: 22
 ansible_ssh_private_key_file: "{{ pk_path }}"
-ansible_become_pass: "{{ vault.k3s.postgres.sudo }}"
+ansible_become_pass: "{{ vault_k3s.postgres.sudo }}"
 host:
   hostname: "k3s-postgres"
   ip: "{{ ansible_host }}"