Add Loki ruler config to loki.yml and defaults

defaults/main.yml

@@ -76,6 +76,7 @@ loki_table_manager_config:
   retention_deletes_enabled: false
   retention_period: 0s
 
+loki_ruler_config: []
 
 promtail_client_config:
   - url: "http://{{ loki_listen_address }}:{{ loki_listen_port }}/loki/api/v1/push"

templates/loki.yml.j2

@@ -57,3 +57,7 @@ table_manager:
 runtime_config:
   {{ loki_runtime_config | to_nice_yaml(indent=2) | indent(2, False) }}
 {% endif %}
+{% if loki_ruler_config != [] %}
+ruler:
+  {{ loki_ruler_config | to_nice_yaml(indent=2) | indent(2, False) }}
+{% endif %}