add caddy file

Caddyfile

@@ -0,0 +1,14 @@
+:8088 {
+  root * /usr/share/caddy
+  file_server
+  encode gzip zstd
+  try_files {path}.html {path} /
+
+  handle_errors {
+        @404 {
+            expression {http.error.status_code} == 404
+        }
+        rewrite @404 /404.html
+        file_server
+    }
+}