Add index to speed up the XTEA key brute force command

Signed-off-by: Graham <gpe@openrs2.org>

archive/src/main/resources/org/openrs2/archive/migrations/V1__init.sql

@@ -43,6 +43,7 @@ CREATE TABLE containers (
 );
 
 CREATE INDEX ON containers USING HASH (crc32);
+CREATE INDEX ON containers (id) WHERE encrypted AND key_id IS NULL;
 
 CREATE TABLE brute_force_iterator (
     last_container_id BIGINT NULL,