feat(heimdall): setup uptime-kuma service.

modules/servers/heimdall/uptime-kuma.nix

@@ -0,0 +1,24 @@
+{...}: {
+  services.uptime-kuma = {
+    enable = true;
+    settings = {
+      HOST = "127.0.0.1";
+    };
+  };
+  services.traefik.dynamicConfigOptions.http = {
+    services.uptime-kuma.loadBalancer.servers = [
+      {
+        url = "http://localhost:3001";
+      }
+    ];
+
+    routers.uptime-kuma = {
+      rule = "Host(`uptime.cronyakatsuki.xyz`)";
+      tls = {
+        certResolver = "porkbun";
+      };
+      service = "uptime-kuma";
+      entrypoints = "websecure";
+    };
+  };
+}