Install Sentinel if needed

redis/defaults/main.yml

@@ -48,3 +48,5 @@ redis_restart_if_needed: True
 redis_restart_force: False
 
 redis_disabled_commands: []
+
+redis_sentinel_install: False

redis/tasks/main.yml

@@ -14,6 +14,15 @@
     - redis
     - packages
 
+- name: Redis Sentinel is installed.
+  apt:
+    name: "redis-sentinel"
+    state: present
+  tags:
+    - redis
+    - packages
+  when: redis_sentinel_install
+
 - name: Get Redis version
   shell: "redis-server -v | grep -Eo '(v=\\S+)' | cut -d'=' -f 2 | grep -E '^([0-9]|\\.)+$'"
   changed_when: false