refactor(ansible): centralize inventory and variables in 'vars' directory

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

vars/docker.ini

@@ -0,0 +1,13 @@
+[docker_host]
+docker-host01 ansible_become_pass="{{ vault.docker.host01.sudo }}"
+docker-host10
+docker-host12
+
+[docker_lb]
+docker-lb ansible_become_pass="{{ vault.docker.lb.sudo }}"
+
+[docker]
+
+[docker:children]
+docker_host
+docker_lb