feat: add setup-grafana target and default Grafana configuration file

makefile

@@ -223,7 +223,14 @@ deploy-gitea: pull
 	set +a ;\
 	docker stack deploy --compose-file ./swarm/gitea.yml gitea ;\
 	}
-deploy-grafana: pull
+setup-grafana:
+	{ \
+	echo "Setting up grafana config on host..." ;\
+	mkdir -p /var/data/grafana/provisioning/datasources /var/data/grafana/dashboards ;\
+	cp -n ./swarm/grafana/grafana.ini /var/data/grafana/grafana.ini 2>/dev/null || echo "grafana.ini already exists, skipping" ;\
+	cp -n ./swarm/grafana/provisioning/datasources/prometheus.yml /var/data/grafana/provisioning/datasources/prometheus.yml 2>/dev/null || echo "prometheus datasource already exists, skipping" ;\
+	}
+deploy-grafana: pull setup-grafana
 	{ \
 	echo "Deploying the grafana stack..." ;\
 	set -a ;\

swarm/grafana/grafana.ini

@@ -0,0 +1,24 @@
+# Default Grafana configuration for the Swarm stack.
+# Copied to /var/data/grafana/grafana.ini by make setup-grafana.
+
+[server]
+protocol = http
+http_port = 3000
+
+[security]
+admin_user = ${ADMIN_USER:-admin}
+admin_password = ${ADMIN_PASSWORD:-admin}
+
+[users]
+allow_sign_up = false
+
+[analytics]
+check_for_updates = false
+reporting_enabled = false
+
+[log]
+mode = console
+level = info
+
+[plugins]
+install = ${GF_INSTALL_PLUGINS:-}