deny robots via Caddyfile

docker/Caddyfile

@@ -1,9 +1,20 @@
 # https://caddyserver.com/docs/caddyfile
 {
-  admin off
+    admin off
 }
 
 {$HOSTNAME} {
     tls {$LETSENCRYPT_EMAIL}
+
+    header {
+        X-Robots-Tag "none"
+    }
+
+    respond /robots.txt 200 {
+        body "User-agent: *
+Disallow: /"
+        close
+    }
+
     reverse_proxy inventory:8000
 }