new: [docker-registry-auth] allow usage of acl rules for public access.

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

docker-registry-auth/lib/common

@@ -39,7 +39,7 @@ make_users_config() {
         bcrypt=$(e "$password" | htpasswd -niB "$user" | cut -f 2 -d ":")
         echo "    password: \"$bcrypt\""
     done < <(e "$users_charm_cfg" | shyaml key-values-0)
-
+    echo "  \"\": {}"  ## Allow anonymous
 }