feat(gitops): implement native custom gitops solution with webhooks

hosts/Testing/default.nix

@@ -0,0 +1,49 @@
+{ config, pkgs, lib, system, ... }:
+
+{
+  config = {
+    homelab = {
+      apps = {
+        freshrss.enable = true;
+        traefik.enable = true;
+      };
+      virtualisation.guest.enable = true;
+    };
+
+    networking = {
+      hostName = "Testing";
+      hostId = "aaaa9200";
+      domain = "roxanne.depeuter.dev";
+
+      useDHCP = false;
+
+      enableIPv6 = true;
+
+      defaultGateway = {
+        address = "192.168.0.1";
+        interface = "ens18";
+      };
+
+      # Open ports in the firewall.
+      firewall = {
+        enable = true;
+      };
+
+      interfaces.ens18 = {
+        ipv4.addresses = [
+          {
+            address = "192.168.0.92";
+            prefixLength = 24;
+          }
+        ];
+      };
+
+      nameservers = [
+        "1.1.1.1" # Cloudflare
+        "1.0.0.1" # Cloudflare
+      ];
+    };
+
+    system.stateVersion = "24.05";
+  };
+}