feat(redis): add ansible role

roles/redis/defaults/main/container.yml

@@ -17,8 +17,7 @@ redis_container_image: >-2
     + ':' +
     (redis_container_image_tag | default(
       redis_version + (
-        ((redis_container_image_flavour is string)
-            and (redis_container_image_flavour | length > 0))
+        (redis_container_image_flavour | default(false, true) | bool)
         | ternary('-' + (redis_container_image_flavour | default('')), '')
       ),
       true,

roles/redis/defaults/main/main.yml

@@ -3,7 +3,7 @@ redis_version: "7.2.4"
 redis_state: "present"
 redis_instance: ~
 redis_instance_suffix: >-2
-  {{ ((redis_instance is string) and (redis_instance | length > 0))
+  {{ (redis_instance | default(false, true) | bool)
     | ternary('-' + (redis_instance | default('', true)), '') }}
 redis_user: >-2
   redis{{ redis_instance_suffix }}