added loki client role

roles/docker_loki_client/templates/config.alloy.j2

@@ -0,0 +1,39 @@
+discovery.docker "linux" {
+    host = "unix:///var/run/docker.sock"
+    }
+
+    discovery.relabel "logs_integrations_docker" {
+    targets = []
+
+    rule {
+        source_labels = ["__meta_docker_container_name"]
+        regex         = "/(.*)"
+        target_label  = "container_name"
+    }
+
+    rule {
+        source_labels = ["__meta_docker_image_name"]
+        regex         = "(.*)"
+        target_label  = "image_name"
+    }
+
+    rule {
+        source_labels = ["__meta_docker_container_id"]
+        regex         = "(.*)"
+        target_label  = "container_id"
+    }
+    } 
+
+    loki.source.docker "default" {
+    host       = "unix:///var/run/docker.sock"
+    targets    = discovery.docker.linux.targets
+    labels     = {"source" = "docker", host = "{{ docker_loki_client_config.hostname }} "}
+    relabel_rules = discovery.relabel.logs_integrations_docker.rules
+    forward_to = [loki.write.default.receiver]
+    }
+    
+    loki.write "default" {
+    endpoint {
+        url = "{{ docker_loki_client_config.loki.address }}/loki/api/v1/push"
+    }
+    }