metrics: Add metrics with victoriametrics + grafana

configuration/services/metrics/victoriametrics.nix

@@ -0,0 +1,13 @@
+{config, ...}: {
+  config.services.victoriametrics = {
+    enable = true;
+
+    scrapeConfigs = {
+      gitea = {
+        targets = ["127.0.0.1:${toString config.services.gitea.settings.server.HTTP_PORT}"];
+        extraSettings.authorization.credentials_file = config.sops.secrets."gitea/metrics-token".path;
+      };
+      coturn.targets = ["127.0.0.1:9641"];
+    };
+  };
+}