added loki client role

roles/docker_loki_client/templates/vector.yaml.j2

@@ -0,0 +1,34 @@
+sources:
+  journald:
+    type: journald
+
+transforms:
+  tag_journald:
+    type: remap
+    inputs:
+      - journald
+    source: |
+      .source = "journald"
+      .unit = ._SYSTEMD_UNIT
+      .process = ._COMM
+      .priority = .PRIORITY
+      .host = "{{ docker_loki_client_config.hostname }}"
+
+sinks:
+  loki:
+    type: loki
+    inputs:
+      - tag_journald
+    endpoint: "{{ docker_loki_client_config.loki.address }}"
+    healthcheck:
+      enabled: false
+    encoding:
+      codec: json
+    labels:
+{% raw %}
+      host: "{{ .host }}"
+      source: "{{ .source }}"
+      unit: "{{ .unit }}"
+      process: "{{ .process }}"
+      priority: "{{ .priority }}"
+{% endraw %}