Add dashboards output (#46)

modules/workloads/infra/outputs.tf

@@ -0,0 +1,10 @@
+output "grafana_dashboard_urls" {
+  value = [concat(
+    grafana_dashboard.workloads.*.url,
+    grafana_dashboard.nodes.*.url,
+    grafana_dashboard.nsworkload.*.url,
+    grafana_dashboard.kubelet.*.url,
+    grafana_dashboard.cluster.*.url,
+  )]
+  description = "URLs for dashboards created"
+}