Add caddy ddns module config

caddy/Caddyfile

@@ -1,3 +1,14 @@
+{
+  dynamic_dns {
+    provider cloudflare {env.CLOUDFLARE_API_KEY}
+    domains {
+      nvengal.com @
+    }
+    check_interval 5m
+    versions ipv4
+  }
+}
+
 git.nvengal.com {
   reverse_proxy gitea:3000
 }