add the ansible playbooks for the monitoring stack

ansible/roles/promtail/templates/promtail.service.j2

@@ -0,0 +1,24 @@
+[Unit]
+Description=Promtail Log Collector
+Documentation=https://grafana.com/docs/loki/latest/clients/promtail/
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+Type=simple
+User=root
+Group=root
+ExecStart=/usr/local/bin/promtail \
+  -config.file=/etc/promtail/promtail.yml \
+  -config.expand-env=true
+
+SyslogIdentifier=promtail
+Restart=always
+RestartSec=5
+
+# Need root for syslog port 514 and journal access
+# Can use CAP_NET_BIND_SERVICE instead if preferred
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+
+[Install]
+WantedBy=multi-user.target