fix database URLs with special characters for docker (#4976)

.docker/dbtest.php

@@ -1,9 +1,9 @@
 <?php
-$DB_HOST = $argv[1];
+$DB_HOST = urldecode($argv[1]);
-$DB_BASE = $argv[2];
+$DB_BASE = urldecode($argv[2]);
 $DB_PORT = $argv[3];
-$DB_USER = $argv[4];
+$DB_USER = urldecode($argv[4]);
-$DB_PASS = $argv[5];
+$DB_PASS = urldecode($argv[5]);
 
 echo "Testing DB:";
 echo "*";