added server_type to cache

tasks/main.yml

diff --git a/tasks/main.yml b/tasks/main.yml
index b8219fb..8c1e429 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -18,6 +18,11 @@
     set_fact:
       self_status: false
 
+- name: Persist server_type setting
+  cache:
+    key: 'server_type'
+    value: '{{ server_type }}'
+
 - name: Persist reachability setting
   cache:
     key: 'reachability'