add loki role

roles/loki/templates/loki.service.j2

@@ -0,0 +1,19 @@
+{{ ansible_managed | comment }}
+
+[Unit]
+Description=Loki
+After=network-online.target
+
+[Service]
+Type=simple
+User={{ loki_user }}
+Group={{ loki_group }}
+ExecStart={{ loki_bin_path }}/loki \
+  -config.file {{ loki_config_path }}
+WorkingDirectory={{ loki_var_path }}
+
+Restart=always
+RestartSec=1
+
+[Install]
+WantedBy=multi-user.target

roles/loki/templates/loki.yaml.j2

@@ -0,0 +1,30 @@
+{{ ansible_managed | comment }}
+---
+{% if loki_auth_enabled is defined %}
+auth_enabled: {{ loki_auth_enabled | bool | lower }}
+{% endif %}
+
+{% if loki_server is defined %}
+server:
+  {{ loki_server | to_nice_yaml(indent=2) | indent(2, False) }}
+{% endif -%}
+
+{% if loki_ingester is defined %}
+ingester:
+  {{ loki_ingester | to_nice_yaml(indent=2) | indent(2, False) }}
+{% endif -%}
+
+{% if loki_schema_config is defined %}
+schema_config:
+  {{ loki_schema_config | to_nice_yaml(indent=2) | indent(2, False) }}
+{% endif -%}
+
+{% if loki_storage_config is defined %}
+storage_config:
+  {{ loki_storage_config | to_nice_yaml(indent=2) | indent(2, False) }}
+{% endif -%}
+
+{% if loki_limits_config is defined %}
+limits_config:
+  {{ loki_limits_config | to_nice_yaml(indent=2) | indent(2, False) }}
+{% endif -%}